Guardian: The Lonely and Great God starred what BtoB boy group member?
Yook Sung-jae Yook Sung-jae (; born (1995--) 2, 1995 ) is a South Korean singer, actor and host. He is a member 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, "" (2015), "" (2015) and "" (2016).
D.O. (entertainer) Do Kyung-soo (born (1993--) 12, 1993 ), better known by his stage name D.O., is a South Korean singer and actor. He is best known as a member and one of the main vocalists of the South Korean-Chinese boy group EXO. Apart from his group's activities, D.O. has also starred in various television dramas and movies such as "Pure Love" (2016) and "My Annoying Brother" (2016).