 Guardian: The Lonely and Great God starred what BtoB boy group member?
Guardian: The Lonely and Great God: Guardian: The Lonely and Great God (), known internationally as simply Goblin, is a South Korean television series starring Gong Yoo, Kim Go-eun, Lee Dong-wook, Yoo In-na, and Yook Sung-jae. Yook Sung-jae:  He is a member of the boy group BtoB and its sub-group, BtoB Blue.
i don't know