Having performed on M! Countdown yesterday, B2ST's Dongwoon and Doojoon will be the only B2ST unit that will perform on the Christmas Eve edition of Music Bank on December 24th. Dongwoon and Doojoon have really shone in their performance of their self-composed track, "When the Door Closes", with their solid vocals and piano playing skills. Get ready to be swooned by them all over again below!