Myung Jaehyun

Myung Jaehyun, known professionally as Jaehyun, is a South Korean singer, rapper, dancer, songwriter, and television host. He is the leader of the six-member boy group BoyNextDoor under KOZ Entertainment, which debuted in May 2023. Jaehyun is known for his energetic stage presence, quick wit as an MC, and his role as the mood-maker of the group. As of 2026, he has amassed a dedicated fanbase and is recognized for his versatility as a performer and producer. [edit]

Jaehyun was born and raised in Daebang-dong, Seoul. He attended Seoul Singil Elementary School, Seongnam Middle School, and graduated from Seongnam High School, where he served as captain of a sports team and was active in an economics club. He also had a passion for writing poetry and entered competitions. Before joining KOZ, he trained at YG Entertainment and took dance classes at Def Dance Skool. A pivotal moment came when he worked part-time at a pub near Haehwa station at age 20. While serving customers, he saw former practice friends performing on a music show on TV. The shock made him drop and shatter glasses, leading him to temporarily give up on his idol dream. Soon after, companies reached out, and he resolved to pursue his dream again. He auditioned for KOZ on the last day of the other members' monthly evaluation, immediately beginning debut preparations. [edit]

Jaehyun debuted as leader of BoyNextDoor on May 30, 2023, with the single album WHO!. In 2024, he became an MC for M Countdown, earning praise for his charm and co-host chemistry. The group made their Japanese debut on July 10, 2024. On May 13, 2025, BoyNextDoor released their first full-length album No Genre. Later in 2025, they released another full-length album HOME, which included the track 06070 telling Jaehyun's personal story of working at a pub. Within the group, Jaehyun handles rap, singing, and energizing performances, and also serves as a music producer, known for offering fierce feedback and monitoring all night. [edit]

Jaehyun is known for his puppy-like appearance and lively personality, making him the mood-maker of BoyNextDoor. The media portrays him as a dependable leader and approachable boy-next-door figure. His improvisational skills and eloquence win audience favor, and his singing and dancing abilities deliver spectacular performances. On stage, he brings fun and cheerful vibes. In short videos, he showcases creative abilities and variety skills. His social media voice is quick-witted and engaging. [edit]

The BOND fandom operates as a unified force rather than a collection of individual stans, channeling their energy through the collective identity of BOYNEXTDOOR. This cohesive structure has propelled Jaehyun into high-profile solo roles, most notably his year-and-eight-month tenure hosting M Countdown, where he balanced quick wit with genuine engagement. Fans rallied behind his leadership during a public ankle injury scare in June 2026, turning his recovery narrative into a shared story of resilience that defined his early career mythology. Their mobilization was equally evident at the Grammy Museum in September 2025, where the group's performance captivated international audiences and cemented Jaehyun's status as a global breakout star. Despite this rapid ascent, iFANN's Global Fame Engine has evaluated Myung Jaehyun as of August 2026 and determined that he currently holds no placement in the published rankings, including the Global Top 1,000 or any Top-100 scope list.[edit]

Myung Jaehyun carries a surname that remains exceptionally rare across South Korea. He embraces a playful persona, often calling himself the doggy of BoyNextDoor while openly admitting to being a devoted dog person. His athletic interests span soccer, which serves as his primary gateway to fans, and golf. A quirky habit sees him constantly stuffing keychains into his pants pockets and bags, drawing stylistic inspiration from icons like Pharrell Williams and Tyler, the Creator. In private moments, he finds joy listening to fellow member Taesan's music while showering. Although his stage presence radiates energy, member Sungho notes that Jaehyun is actually quite shy off-camera. He shares his birthday on December 4 with artists Kang MiNa and Doyeon. The legend of his dedication grew after an ankle injury in June 2026; despite a partial ligament sprain diagnosis, he publicly expressed a fierce desire to perform, a story fans now retell to highlight his work ethic. His background as a former trainee leader at YG Entertainment further cements his reputation for maturity before he even debuted.[edit]

Jaehyun comes from a family of four: his parents and an older brother born in 1999. He spent part of his childhood living abroad, though specific locations have not been publicly detailed. As of 2026, Jaehyun lives with his family in Seoul. No pets have been publicly mentioned. [edit]

Jaehyun is a member of BoyNextDoor alongside Sungho, Riwoo, Taesan, Leehan, and Woonhak. He has a unit called Woonmyungz with Woonhak. He trained at YG Entertainment before joining KOZ Entertainment, founded by Zico. His M Countdown co-hosts during his MC tenure were not publicly named. [edit]

As of 2026, Myung Jaehyun has no publicly confirmed romantic relationships. He has not been linked to any dating partners, nor has he publicly discussed past or current relationships. He is currently single. [edit]

iFANN currently estimates Myung Jaehyun's personal net worth at $1 Million as of 2026. As a relatively new idol who debuted in 2023, his income primarily comes from group activities including album sales, concerts, merchandise, and brand endorsements. His role as MC for M Countdown also contributed significantly to his earnings. Individual financial details remain private, but group success from albums like WHO! and No Genre has likely increased his wealth.[edit]