Cadmium, Dylan Rouda - Have Fun Alone [digital single] (2022) by Cadmium (보컬), Dylan Rouda (보컬) on maniadb.com

Have Fun Alone is a tragic love story of a boy being left by the girl he loved while she ran off into the world to find someone better. In the end after so long, she realized she made a mistake and came running back, but by then the boy has moved on and and blows her off with the remark "Have Fun Alone" .... ....