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Yook Sung-jae (Korean: 육성재; born () May 2, 1995), also known mononymously as Sungjae, is a South Korean singer, songwriter, actor, model, host and entertainer. He is a member of the boy group BtoB and its sub-group, BtoB Blue .
Yook Sung Jae is a South Korean singer, dancer, actor, and member of BTOB (비투비). He graduated from Hanlim Arts High School and later obtained a bachelor's degree in Practical Music from Dongshin University.