Woonhak Biography: Net Worth, Siblings, Height, Ethnicity, Age, Parents, Music

Kim Woonhak, known by his stage name Woonhak, is a South Korean singer and the youngest member of the K-pop boy group BOYNEXTDOOR, formed under KOZ Entertainment.

He gained significant attention following the group’s debut in May 2023 with the single album “WHO!” Woonhak’s youthful energy, engaging personality, and musical talents quickly endeared him to fans.  

Profile

• Full name: Kim Woon Hak
• Nickname: Woonhak
• Date of birth: November 29, 2006
• Age: 18 years old
• Gender: Male
• Place of birth: Iui-dong, Yeongtong, Suwon, Gyeonggi-do, South Korea
• State of origin: Gyeonggi-do
• Nationality: South Korean
• Profession: Singer, MC
• Height: 182 cm (6’0″)
• Parents: N/A
• Siblings: Younger sister
• Spouse: None
• Children: None
• Relationship status: Single
• Religion: N/A
• Ethnicity: Korean
• Net worth: $900,000

Early Life and Education

Kim Woonhak was born on November 29, 2006, in Iui-dong, Yeongtong, Suwon, Gyeonggi-do, South Korea. As of 2025, he is 19 years old. Growing up in Suwon, Woonhak developed an early interest in music, which led him to pursue a career in the entertainment industry.

He became a trainee at KOZ Entertainment in 2020, marking the beginning of his journey in the K-pop industry. Details about his formal education, including the schools he attended and his academic achievements, are not available.

Personal Life

Information regarding Woonhak’s personal life, including details about his family, relationships, and any public appearances with family members, is limited.

He has mentioned in interviews that he has a younger sister, who he describes as his favourite person in the world, expressing that he misses her when they can’t see each other often. Also, there are no publicly confirmed details about his current relationship status, romantic relationships, or other aspects of his personal life.

Career

Woonhak’s career in the entertainment industry began when he joined KOZ Entertainment as a trainee in 2020. He debuted as a member of BOY NEXT DOOR on May 30, 2023, with the release of their single album “WHO!” As the youngest member, or “maknae,” of the group, Woonhak brings a fresh and dynamic energy to their performances.

His contributions to the group’s music include writing and composing several tracks. Notably, he co-wrote and composed “Amnesia” for BOYNEXTDOOR‘s EP “HOW?” released in 2024.

In addition to his musical endeavours, Woonhak expanded his presence in the entertainment industry by becoming the youngest-ever MC of the popular South Korean music show Inkigayo in July 2023, alongside Yeonjun of TOMORROW X TOGETHER and actress Park Ji Hu.

Net Worth

Woonhak’s net worth is estimated to be 900,000. As a member of BOYNEXTDOOR under KOZ Entertainment, his income is likely derived from the group’s music sales, performances, and other entertainment activities.

Social Media

• Instagram: @woonhak.koz
• X: @woonhak_koz
• TikTok: @woonhak_koz
• YouTube: BOY NEXT DOOR Official

Discography

• EP: WHY:
• But I Like You (돌아버리겠다)
• One and Only
• Serenade
• Crying
• But Sometimes (뭣 같아)
• ABCDLOVE