Kim Hyun-joong is a South Korean actor and singer, best known for his role as Yoon Ji-hoo in the popular television series Boys Over Flowers. He gained fame as a member of the boy band SS501, which debuted in 2005 and achieved significant success in the K-pop industry. In addition to his music career, Kim has appeared in various dramas and films, showcasing his versatility as an entertainer. He has also participated in reality shows and variety programs, further solidifying his popularity in South Korea and beyond.