Boo Seung-kwan, known mononymously as Seungkwan, is a South Korean singer-songwriter under Pledis Entertainment. He is a member of the boy group SEVENTEEN, its vocal team sub-unit, and its special sub-units BSS and DxS. Apart from his group's activities, Seungkwan is known as an entertainment figure for his active participation in Korean variety shows such as Unexpected Q, Prison Life of Fools, and The Devil's Plan. Seungkwan has also released several OSTs that have been commercially successful in South Korea.