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).
Keith Duffy Keith Peter Thomas Francis John Duffy (born 1 October 1974) is an Irish singer-songwriter, actor, radio and television presenter and drummer who began his professional music career as part of Irish boy band Boyzone alongside Ronan Keating, Mikey Graham, Shane Lynch and Stephen Gately in 1993. The band decided to focus on solo projects in 2000 since which Duffy has achieved critical acclaim for his acting roles, particularly in soap operas such as "Coronation Street" and "Fair City". He has also presented "The Box" and "You're a Star".