Changsub is a South Korean singer and member of the boy group BTOB, which debuted in 2012 under CUBE Entertainment. He is known for his powerful vocals and has contributed to many of the group's songs, showcasing his talent as a performer and songwriter. In addition to his work with BTOB, Changsub has pursued solo projects, including his own music releases. He has participated in various television programs, demonstrating his versatility and charm, which has helped him gain a dedicated fanbase both in South Korea and internationally.