Leehan Profile: Age, Height, Career, Facts & More
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Few idols balance clean, powerful dance lines with a genuine love of aquascaping quite like Leehan.
As BOYNEXTDOOR’s visual and vocalist, he brings a warm, jazz-influenced mid-low tone and a tall, striking presence to the group’s performances — while off stage, he’s just as likely to be found talking to his fish as he is rehearsing choreography.
This complete profile breaks down everything fans want to know about Leehan — his age, height, career, personality, and the fun facts that keep circulating through the fandom.
Quick Facts About Leehan
- Real Name: Kim Dong-hyun (김동현)
- Stage Name: Leehan (이한)
- Birth Date: October 20, 2004
- Zodiac Sign: Libra
- Birthplace: Busan, South Korea
- Position: Vocalist, Dancer, Visual
- Height: Approximately 179–180 cm (5’11”)
- Blood Type: O
- Nationality: South Korean
- Agency: KOZ Entertainment (HYBE)
- Group: BOYNEXTDOOR
- MBTI: ESFJ
- Representative Emoji: 🐠 (Fish)
Early Life and Background
Leehan was born Kim Dong-hyun on October 20, 2004, in Busan, South Korea. Before pursuing a career in entertainment, he was a competitive taekwondo athlete, a background that likely contributed to the clean, powerful dance lines he’d later become known for as a performer.
That athletic discipline, combined with his natural vocal ability, made him a well-rounded trainee by the time he joined KOZ Entertainment ahead of BOYNEXTDOOR’s formation.
Career Highlights
Debut and BOYNEXTDOOR’s Formation Leehan officially debuted as a member of BOYNEXTDOOR on May 30, 2023, with the single album WHO!, marking the launch of KOZ Entertainment’s first-ever boy group.
As vocalist and visual, his warm, mid-low tone — influenced by a genuine appreciation for jazz — and his tall, slender frame quickly made him one of the group’s most visually distinctive members.
An All-Rounder On Stage Leehan has built a reputation as a genuine all-rounder within BOYNEXTDOOR, known for his clean, powerful dance lines alongside his vocal contributions.
He’s also occasionally taken on bass duties during the group’s live performances, adding another layer to his musical versatility beyond his primary role as vocalist.
Chart Milestones and Global Reach As part of BOYNEXTDOOR, Leehan contributed to the group’s growing chart success, including their track “19.99,” which scored the group’s first entry at Number 1 on Billboard’s World Albums chart and placed them inside the Billboard 200’s top 40.
BOYNEXTDOOR went on to perform at major festival stages across South Korea, Spain, Japan, Hong Kong, and the United States, and were featured in a K-pop exhibit at the Grammy Museum in Los Angeles in 2024.
Japan Debut BOYNEXTDOOR expanded into the Japanese market on July 10, 2024, with the maxi single “And,,” featuring Japanese re-recordings of the group’s earlier singles alongside the original Japanese-language track “Good Day.” The release marked the group’s third Number 1 single on Japan’s Oricon Chart.
Personality and Public Image
Off stage, Leehan is widely described as gentle, creative, and a little quirky — a personality that shows through most clearly in his well-known love of fishkeeping and aquascaping.
He’s known for talking to his fish and building elaborate aquarium setups, embracing the hobby without worrying about fitting a typical idol image, something fans say reflects the same genuine warmth and sincerity he shows toward people.
He’s also known for a deep affection for winter activities and good food, rounding out a personality fans describe as authentic and easy to root for.
That authenticity has become one of Leehan’s defining traits within the fandom, particularly as he’s continued to share his aquascaping projects openly rather than curating a more conventional idol image.
Fans appreciate that he doesn’t shy away from talking at length about his fish tanks during interviews or livestreams, treating the hobby as a genuine passion rather than a quirky footnote.
Combined with his tall, striking visuals and jazz-influenced vocal tone, that unpretentious authenticity has made him one of the members fans feel they know most intimately, despite BOYNEXTDOOR’s relatively short time in the industry.
Fun Facts and Trivia
- Leehan is a former competitive taekwondo athlete.
- He’s passionate about aquascaping and fishkeeping, often building and maintaining his own aquarium setups.
- His warm, mid-low vocal tone is influenced by a genuine appreciation for jazz music.
- He occasionally plays bass during the group’s live performances.
- His representative emoji is a fish, a nod to his beloved hobby.
- His MBTI type is ESFJ, often described as “The Consul” or “The Caregiver.”
- He’s praised for his tall, slender build and distinctive visual features within the group.
- He’s known for treating his aquascaping hobby as a genuine creative outlet, often comparing the process of designing a tank layout to arranging a song.
Social Media and Where to Follow
Leehan is active across BOYNEXTDOOR’s official group platforms, including Instagram, X (formerly Twitter), TikTok, and YouTube, where his vocal performances, dance content, and glimpses of his aquascaping hobby continue to draw significant fan engagement.
His authentic, quirky personality and genuine love for his fish have become one of the most beloved recurring elements of his individual content, resonating with fans who appreciate his refusal to fit a typical idol mold.
As BOYNEXTDOOR’s reach has grown through festival appearances, chart milestones, and their Japanese debut, Leehan’s warm vocal tone and striking visual presence continue to be among the most consistently praised elements of the group’s performances.
Conclusion
From a former taekwondo athlete to BOYNEXTDOOR’s warm-toned visual with a genuine, unapologetic love of aquascaping, Leehan’s career reflects a rare combination of performance discipline and heartfelt authenticity.
Whether fans are drawn in by his clean, powerful dance lines, his jazz-influenced vocal tone, his striking visuals, or his charmingly quirky devotion to his fish, Leehan continues to prove why he’s regarded as one of the most genuinely endearing members of his generation.
As BOYNEXTDOOR’s global reach continues to expand, all eyes remain on Leehan to see what he’ll sing, dance, and aquascape next.
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