Kim Sunggyu is a South Korean singer and songwriter, best known as the leader of the boy group INFINITE. He debuted with the group in 2010 and gained popularity for his powerful vocals and charismatic stage presence. In addition to his work with INFINITE, Kim Sunggyu has pursued a solo career, releasing several albums and singles. He is recognized for his emotional performances and has participated in various television programs, showcasing his versatility as an artist.