KOZ Entertainment K-pop boy group Boynextdoor consists of members Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak, and they debuted on May 30, 2023. They are the first boy group to be produced by K-pop artist Zico at his own company (KOZ), which is owned by HYBE, and they have a charming and down-to-earth energy that has won them many fans. (The fandom is called “Onedoor“!) Boynextdoor won their first music show on September 12, 2023 at The Show for the song “뭣 같아 (But Sometimes),” but there are surely many more accolades where that came from. K-Pop Answers presents this comprehensive, current, and regularly updated Boynextdoor members profile page with a bio, MBTI, fun facts, and other trivia for Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak — and every fact has been painstakingly researched by us with citations! Please enjoy!

(However, if you just want to know how old the Boynextdoor members are, we have a separate page to explain that in depth!)

Boynextdoor Members Profile: Sungho, Riwoo, Jaehyun, Taesan, Leehan, and Woonhak Bio & Facts

Sungho Profile: Bio, Facts, and Trivia

Sungho Bio & Profile Summary: Sungho, born on September 4, 2003 as Park Sungho (박성호), is the oldest of the Boynextdoor members and the “energizer” of the group. He was the first member of the group to join KOZ Entertainment and was a trainee for about three years and nine months. Sungo has an MBTI of ENTJ, his nickname is “Top Gun,” and he enjoys drawing. According to Riwoo, Sungho is the “most mature” member of Boynextdoor.

• Sungho sang Maroon 5’s “Sunday Morning” for his company audition. [Singles Interview, August 18, 2023]
• Sungho was in seventh grade when he realized he wanted to be an idol, but it wasn’t until ninth grade that he finally told his parents, who appreciated his honesty and “fully” supported his ambitions. [Weverse Sungho Interview, June 8, 2023]
• Sungho was the school president in one year of middle school, and he was the head student of his boarding house when he attended a boarding school. [Weverse Sungho Interview, June 8, 2023]
• Sungho is left-handed. (Riwoo and Woonhak are also left-handed). [Funnextdoor Episode 1, July 7, 2023]
• Sungho has his own room in the Boynextdoor dorm (which he keeps tidy), but he lives with members Riwoo and Leehan in the “lower home,” below the other three members. [Funnextdoor Episode 1, July 7, 2023]
• Sungho played guitar in a band in middle school. [Weverse Sungho Interview, June 8, 2023]
• Sungho enjoys many genres of music, including jazz and occasionally classical music. His favorite musical artists are Tom Misch, FKJ, and Billie Eilish. [Weverse Sungho Interview, June 8, 2023 / NME 30 Questions, June 30, 2023]
• Sungho’s favorite colors are sky blue and purple because they are “harmless and subtle.” [NME 30 Questions, June 30, 2023]
• Sungho loves watching dramas and movies, but he is “more enamored by the cinematography rather than the plot.” [Weverse Sungho Interview, June 8, 2023]
• Sungho likes drawing and going to art exhibitions, and he is interested in architecture. When he was young he thought he would like to become a painter. [Doorview: Leehan’s View, June 21, 2023 / Weverse Sungho Interview, June 8, 2023]
• Riwoo has called Sungho the most mature member of Boynextdoor, and he added, “Whenever we get a bit sloppy at parts, Sungho’s the one who zeros in on them, and gives us feedback.” [Weverse Riwoo Interview, June 9, 2023]
• Sungho says he has “really bad eyesight,” so he usually wears contacts. He looks “very friendly” when he wears glasses though. [W Korea 24 Days of Their Debut, June 22, 2023]
• Woonhak says Sungho is “good at English,” but there are few video examples to illustrate his English ability at this time. [Doorview: Taesan’s View, June 28, 2023]
• Sungho used to ride horses when he was young and even won a medal once. [NME 30 Questions, June 30, 2023]
• If Sungho had not become an idol, he might have wanted to be a soccer player. [NME 30 Questions, June 30, 2023]
• If he could only eat one thing for the rest of his life, Sungho would choose a “burger meal” and control portion size to make it into a “healthy option.” [NME 30 Questions, June 30, 2023]
• One item on Sungho’s “bucket list” is to watch a soccer game in Europe. He is a fan of FC Barcelona. [W Korea 24 Days of Their Debut, June 22, 2023]
• Sungho hopes that the music of Boynextdoor will become a “core memory” for many people, where listening to the music unlocks memories from the past. [Weverse Sungho Interview, June 8, 2023]

Riwoo Profile: Bio, Facts, and Trivia

Riwoo Bio & Profile Summary: Riwoo, born on October 22, 2003 as Lee Sanghyeok (이상혁), is the second oldest of the Boynextdoor members and the main dancer of the group. He joined KOZ about a month after Sungho joined. Riwoo has an MBTI of ISFP, and although he is one of the most introverted members, he makes a lot of “dad” jokes!

• Riwoo was originally a student of Def Dance Skool, where he befriended fellow student Yoonwoo, who would debut with Trendz in January 2022. (As noted below, Jaehyun also attended Def Dance Skool.) [Def “Love Shot” Performance, February 21, 2019]
• Riwoo joined KOZ because he wanted to be “part of their very first group,” and he “wanted to grow with the company.” [Weverse Riwoo Interview, June 9, 2023]
• Riwoo joined KOZ about a month after Sungho (the first member to join the company) did, and Sungho was “completely mind blown” by Riwoo when Sungho watched him dance: “This guy who was super shy just a second ago turned into a totally different person [when dancing], and I thought he was just amazing.” [Weverse Sungho Interview, June 8, 2023]
• Since Riwoo has an MBTI of ISFP, he is happy when someone cancels plans with him and he can stay home, saying, “I don’t think there’s anything better than that.” However, he feels Leehan (ESFJ) has the personality most similar to his own, and they are roommates. (Riwoo even calls it “fate” that they became roommates.) [Weverse Riwoo Interview, June 9, 2023 / W Korea 24 Days of Their Debut, June 22, 2023 / Funnextdoor Episode 1, July 7, 2023]
• Likewise, Riwoo is “not so comfortable with walking up to someone first and talking to them, so the other members reached out” to him first. [Weverse Riwoo Interview, June 9, 2023]
• Riwoo had wanted to be a professional athlete (particularly a baseball player) because he was “pretty athletic,” but he began taking dance lessons in fifth grade at the suggestion of his mother, who loves music. He felt like his friends treated him differently after they watched him perform BTS’s “Idol” and “DNA” at a middle school dance festival, and he felt “really happy” to perform in general. [Weverse Riwoo Interview, June 9, 2023 / Doorview: Leehan’s View, June 21, 2023]
• Riwoo was class president at some point in school. [Joo Woojae Interview, September 8, 2023]
• Riwoo is left-handed. (Sungho and Woonhak are also left-handed). [Funnextdoor Episode 2, July 14, 2023]
• Riwoo’s favorite music artists are Bruno Mars and Deulgukhwa, his favorite album is Yoo Jae-ha’s Because I Love You, and his favorite song is Bruno Mars’s “Versace on the Floor.” [NME 30 Questions, June 30, 2023]
• If he could only eat one thing for the rest of his life, Riwoo would “live off of doughnuts!” He eats the most of anyone in Boynextdoor, and after filming a music video, he tested how many doughnuts he could eat at once — and finished at 14! [NME 30 Questions, June 30, 2023 / Joo Woojae Interview, September 8, 2023]
• In a hypothetical alternate universe where Riwoo is not an idol, he would like to be a “professional gamer.” [NME 30 Questions, June 30, 2023]
• Most members of Boynextdoor view Riwoo as the group “shopaholic,” as Sungho sees Riwoo “receiving packages every day,” and Leehan added, “Whether it’s big or small, it never seems to stop.” [Singles Korea Interview, September 5, 2023]

Jaehyun Profile: Bio, Facts, and Trivia

Jaehyun Bio & Profile Summary: Jaehyun, born on December 4, 2003 in Seoul as Myung Jaehyun (명재현), is the third oldest of the Boynextdoor members and the leader of the group. He was the last member of the group to join KOZ and is passionate about music production. Jaehyun has an MBTI of ENFP and speaks fluent English, and he is an outgoing yet heartfelt leader, having cried on camera more than once!

• Jaehyun was committed to experiencing everything in school, including being “student president from elementary school onwards,” joining the economics and business management club in high school, and entering writing competitions due to his love of poetry. [Weverse Jaehyun Interview, June 7, 2023]
• Jaehyun was at one point a student of Def Dance Skool, and so was Riwoo. [Def Dance Skool Facebook Post, May 19, 2023]
• Jaehyun says “a lot of companies” initially wanted to sign him, and he was originally working on his own music “without even coming out of [his] studio,” but he ultimately chose to sign with KOZ Entertainment because the KOZ producer made a “huge impact” on him when he said, “I’m not sure if you’ll be able to debut or not, but you can learn a lot here.” Jaehyun was excited at joining an environment where he could “infinitely grow.” [Weverse Jaehyun Interview, June 7, 2023]
• Jaehyun has his own room (which is often messy) in the Boynextdoor dorm, but he lives with members Taesan and Woonhak. (Jaehyun, Taesan, and Woonhak are the Boynextdoor members involved in the music production.) They play “rock paper scissors” to decide who has to do the cleaning because none of them are proactive about cleaning the home. Jaehyun says he has been “super close” to Woonhak since the day they met. [Weverse Jaehyun Interview, June 7, 2023 / Funnextdoor Episode 1, July 7, 2023]
• Jaehyun has explained how the lyrics to “Serenade” are directly inspired by the true story of how his dad wooed his mom: “My dad stood outside my mom’s window every night, telling her that he loved her, so the whole neighborhood ended up knowing what my mom’s name was.” [Weverse Jaehyun Interview, June 7, 2023]
• Prior to filming their debut music videos in the United States, the Boynextdoor members had come to the US once before for dance lessons. However, Jaehyun said the members weren’t very close and couldn’t have as much fun the first time because their debut wasn’t confirmed yet and they were all anxious. They became much closer on their second trip. [Camcordoor 2, August 6, 2023]
• Jaehyun’s mother worked in the music industry and had exposed him to a wide range of music. [NME 30 Questions, June 30, 2023]
• If Jaehyun had pursued a career other than music, it would have been something in fashion. [NME 30 Questions, June 30, 2023]
• If Jaehyun could have a superpower, he would select the ability to calm people down (including himself), because he does “not like the emotion of anger.” How sweet! [DIVE Studios, August 24, 2023]
• Jaehyun has cried several times on camera, simply due to being a heartfelt and emotional person, so he has acknowledged that he is “Boynextdoor’s official crybaby.” [WHY.. Concept Photo Behind, September 7, 2023]
• Jaehyun loves soccer, and when he was really young he was a mid-fielder who dreamed of becoming a professional soccer player. [Weverse Jaehyun Interview, June 7, 2023]
• Jaehyun was afraid of dogs when he was young, but when he briefly lived with his aunt in elementary school, he came to love dogs because his aunt’s dog would sit by him when he got sick. [Weverse Jaehyun Interview, June 7, 2023]
• Jaehyun learned English at a hagwon (paid afterschool academy), and in sixth grade, they went to a haunted house on Halloween, which ended up making him cry. [Funnextdoor Episode 3, July 21, 2023 / Open Door, August 29, 2023]
• Jaehyun is inspired by Pharrell Williams and Tyler, the Creator both musically and by their fashion. Meanwhile, his favorite song is “I Can See Clearly Now” by Johnny Nash. [Weverse Jaehyun Interview, June 7, 2023 / NME 30 Questions, June 30, 2023]

Taesan Profile: Bio, Facts, and Trivia

Taesan Bio & Profile Summary: Taesan, born on August 10, 2004 as Han Dongmin (한동민), is the third youngest of the Boynextdoor members and has a hometown of Gwangju. He deeply loves music of past and present, including from Nirvana, The Carpenters, and Oasis. Taesan has an MBTI of INTJ, his nickname is “Giant Mountain,” and he enjoys producing music and customizing his property. Sungho calls Taesan “definitely the most creative” member.

• Taesan has an MBTI of INTJ, but until ninth grade he was ENFP. [Weverse Taesan Interview, June 12, 2023]
• Taesan’s hometown is Gwangju, and when he goes home, he tries to hike Mudeungsan Mountain to the top with his friends or his dad at least once a year. [Doorview: Woonhak’s View, June 19, 2023]
• Taesan’s nickname is (spoken in English) “Giant Mountain,” a play on words for the name “Taesan.” [Funnextdoor Episode 4, July 28, 2023]
• Taesan likes to read novels over watching movies or dramas because reading novels invites and ignites more of his imagination to tell the story. In turn, Sungho calls Taesan “definitely the most creative” member of the group. [Weverse Taesan Interview, June 12, 2023 / NME 30 Questions, June 30, 2023]
• When Taesan was in kindergarten, his dad introduced him to The Beatles. His dad would go on to recommend more musicians like Nirvana, the Carpenters, and Richard Sanderson, all of whom Taesan loves. Nirvana, Oasis, and The Carpenters are his favorite musicians (with Oasis his “favorite band”), My Chemical Romance’s The Black Parade is his favorite album, and “Top of the World” by The Carpenters is his all-time favorite song. [Weverse Taesan Interview, June 12, 2023 / WHO! Concept Photo BTS / NME 30 Questions, June 30, 2023 / Mnet Plus Magazine Interview, June 8, 2023]
• Taesan won an award for playing piano in elementary school, either at a regional or a national competition, but he has since forgotten much of what he learned. [Camcordoor 3, July 1, 2023]
• Taesan “really started writing music” when he was in tenth grade, and music is what he connects with emotionally. [Weverse Taesan Interview, June 12, 2023]
• Taesan is the one who came up with the six-syllable title lyric on “돌아버리겠다” (meaning “You’re driving me crazy”), and it was chosen out of more than a hundred ideas that the members had conceived. In “Serenade,” he also came up with the lyric, “Man I’m so nervous to death / I relax my stiff lips,” which the producers liked for being relatable. Taesan even came up with the group’s introduction of, “Who’s there? The Boynextdoor!” [Weverse Taesan Interview, June 12, 2023]
• Taesan and Woonhak are roommates, and they live in the same dorm as Jaehyun. (Jaehyun, Taesan, and Woonhak are the Boynextdoor members involved in the music production.) They live in the “upper home,” above the other three members. [Funnextdoor Episode 1, July 7, 2023]
• If Taesan had not gotten into music, he might have wanted to be a taekwondo player. [NME 30 Questions, June 30, 2023]
• If he could only eat one thing for the rest of his life, Taesan would pick sushi. [NME 30 Questions, June 30, 2023]
• If Taesan could have a superpower, he would choose to be able to turn into lightning, so that he could “fly in the sky and move from place to place in an instant.” [DIVE Studios, August 24, 2023]
• Taesan does not believe in ghosts, but he has dreamed about seeing ghosts during sleep paralysis. [DIVE Studios, August 24, 2023]
• Taesan typically cannot bring himself to go on “scary” rides at amusement parks, and he said the other Boynextdoor members teased him for it when they went to an amusement park together. [WHY.. Concept Photo Behind, September 7, 2023]
• Taesan likes to customize clothes and property. [Camcordoor 1, July 30, 2023 / Funnextdoor Episode 1, July 7, 2023]
• Taesan’s favorite color is red because it “leaves a strong impression.” [NME 30 Questions, June 30, 2023]
• Taesan hopes that Boynextdoor’s music can be the soundtrack to their fans’ “memories of today when time passes by.” [Weverse Taesan Interview, June 12, 2023]

Leehan Profile: Bio, Facts, and Trivia

Leehan Bio & Profile Summary: Leehan, born on October 20, 2004 as Kim Donghyeon (김동현), is the second youngest of the Boynextdoor members and grew up in Busan. He has an intense love and knowledge of fish and regularly watches his fish tank! Leehan has an MBTI of ESFJ, but he has a calm and considerate demeanor. Taesan says constantly that Leehan is handsome and the best-looking Boynextdoor member!

• Leehan grew up in Busan, where he often hung out at the beach, surfing or paddleboarding with friends. [Weverse Leehan Interview, June 11, 2023]
• Leehan has loved fish since he was young, and his hobby is maintaining and decorating fish tanks, creating “aquascapes.” KOZ bought a fish tank to put in Leehan’s shared members home, and a fish store worker was actually impressed with how well Leehan cares for his fish. [Weverse Leehan Interview, June 11, 2023 / Funnextdoor Episode 2, July 14, 2023]
• Leehan got curious about what fish food tastes like, so he tried it. He described it as tasting like “that salty taste of rotten cheese.” [Funnextdoor Episode 2, July 14, 2023]
• Leehan began learning taekwondo at age 5, and his dream was to be a competitive taekwondo athlete until eighth grade. [Weverse Leehan Interview, June 11, 2023]
• Leehan joined KOZ at a point when he had less training than the others, and he thought the other members would hate him due to his perceived lack of talent and experience. Fortunately, everyone was “so welcoming and super friendly,” and Riwoo, the first trainee he met, would find “magical solutions” whenever Leehan came to him with difficulties during practice. (They are also roommates.) [Weverse Leehan Interview, June 11, 2023 / Funnextdoor Episode 1, July 7, 2023]
• Prior to debut, Leehan felt that he was a “terrible dancer,” and when he attended a dance academy after school, he would create an actual timetable for himself to make the best use of his time and improve as much as possible. [Weverse Leehan Interview, June 11, 2023]
• Leehan once said he “never really thought” that he was good-looking, but Taesan says Leehan’s role in Boynextdoor is to offer his “good looks”! [Weverse Leehan Interview, June 11, 2023 / W Korea 24 Days of Their Debut, June 22, 2023]
• Leehan’s favorite color is black because it “initiates different moods” depending on perspective. [NME 30 Questions, June 30, 2023]
• If he could only eat one thing for the rest of his life, Leehan would eat jelly (as in gummies). [NME 30 Questions, June 30, 2023]
• Sungho calls Leehan “the most considerate member, a great person to be around for anyone.” [NME 30 Questions, June 30, 2023]
• Leehan would be “really happy” and “love it” if fans set Boynextdoor photos as their phone’s lock screen, because that’s something his friends would do with their favorite idols in school. [Weverse Leehan Interview, June 11, 2023]

Woonhak Profile: Bio, Facts, and Trivia

Woonhak Bio & Profile Summary: Woonhak, born on November 29, 2006 as Kim Woonhak (김운학), is the maknae of the Boynextdoor members. His members often find him really cute even when he’s not trying to be cute. Woonhak has an MBTI of ENFP and is highly energetic like his friend Jaehyun, the other ENFP.

• Woonhak is the maknae (“youngest member”) of Boynextdoor, and the other members regularly call him “cute” and/or “the cutest” member, despite his trying to deny that he is cute. Sungho concedes that Woonhak sometimes surprises them “with a mature side of himself.” [Soompi, June 23, 2023 / NME 30 Questions, June 30, 2023 / W Korea 24 Days of Their Debut, June 22, 2023]
• Woonhak listened to a lot of hip hop in sixth grade that he and his friends could “easily relate to,” and he began taking dance lessons as another way to express that energy. He realized he wanted to become an idol after performing a medley of K-pop songs at a middle school festival and becoming enamored with how much love he received from friends for that performance. [Weverse Woonhak Interview, June 10, 2023]
• The very first dance cover Woonhak ever did was for “9와 4분의 3 승강장에서 너를 기다려 (Run Away)” by TXT, and he told TXT’s Yeonjun that when they cohosted Inkigayo together. [Camcordoor Woonhak Hot Debut, August 24, 2023]
• When Woonhak had been taking lessons at an academy for about six months, KOZ held an audition there, but Woonhak slept in and missed it. Fortunately, KOZ contacted him directly to give him another chance to audition. Woonhak became a trainee for about three years in total. [Weverse Woonhak Interview, June 10, 2023]
• When Woonhak first joined KOZ, he had a buzz cut, and Sungho thought he was memorable because he was “adorable” and a “pure soul” who was also “really bubbly” and “really polite and humble.” [Weverse Sungho Interview, June 8, 2023]
• Taesan says that Woonhak is the “team jester and is emotionally intelligent. When any of us gets sad, he’s right there with you, and he’s really considerate of others.” [Weverse Taesan Interview, June 12, 2023]
• Jaehyun always tells Woonhak that he’s a “teddy bear,” so when Jaehyun wears a teddy bear keychain, he says, “I have Woonhak on my bag!” [Weverse Jaehyun Interview, June 7, 2023]
• Woonhak has said that if he were a cartoon character, he would probably be Luffy from One Piece, in that Woonhak is so outgoing. He explained, “I’d go to the kids in the next class over, and say, ‘Hey, wanna be friends?’ or ‘Wanna go play soccer?’” [Weverse Woonhak Interview, June 10, 2023]
• Woonhak is left-handed. (Sungho and Riwoo are also left-handed). [Funnextdoor Episode 6, August 11, 2023]
• Taesan agrees that Woonhak makes the best chicken breast fried rice in Boynextdoor. [Doorview: Taesan’s View, June 28, 2023]
• If he could only eat one thing for the rest of his life, Woonhak would choose bread, since there are so many different kinds, decreasing the likelihood of getting sick of it. [NME 30 Questions, June 30, 2023]
• Woonhak’s sister is his “favorite person in the world.” [Weverse Woonhak Interview, June 10, 2023]
• Woonhak’s favorite movie is Eternal Sunshine of the Spotless Mind. [EunChaeStardiary EP22, September 21, 2023]
• Woonhak’s motto is: “Keep challenging yourself.” [Weverse Woonhak Interview, June 10, 2023]
• At the time he began at age 16, Woonhak was the youngest ever male MC of Inkigayo, a Korean music show. [Camcordoor Woonhak Hot Debut, August 24, 2023]

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