I Promise to Return

He is a wild big shot man from the Underworld who is feared by many, but then he was forced to become the Yin-Yang Master’s exclusive “slave.” Everyday he’s being forced to work like cattle and always being teased, but he doesn’t have the power to retaliate! Therefore, he should obviously be angry, but why can’t he stand up to that man with a cold appearance? **Original Webtoon:** , **Official Translation:** English: , Others: