Yook Sung-jae (Hangul: 육성재; born May 2, 1995) is a South Korean singer, actor, Entertainer and host. He is a member and the 3rd generation leader of the boy group BtoB and its sub-group, BtoB Blue. Aside from his group's activities, Yook is known for acting in television dramas, Who Are You: School 2015 (2015), The Village: Achiara's Secret (2015) and Guardian: The Lonely and Great God (2016).
