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Kang Seung Sik (강승식, born in April 16, 1995), is a South Korean singer-songwriter and also a musical actor of the South Korean. He debuted as the main vocal of South Korean group Victon in 2016 and become officially become a VICTON Leader in early 2020 after Seungwoo's return ( Seungsik was a temporary a leader during Seungwoo's promotion with X1). As the member and the main vocal of the group, Seung Sik also participated as the songwriter and also a vocal director for the group.

Throughout his career, Seungsik being participated in lots of drama OSTs as solo or unit . He also involved in some solo collaboration/projects songs.

For his musical career , Seungsik also had joined three musicals, On Air Musical and I Loved You as one of the lead actors in 2021 and in 2022 Seungsik was the lead actors for Equal Musical together with the fellow Victon member Sejun.