1: Maid For Tonight

D.O Sarang has always had feelings for Kim Jongin. Little did she know he felt the same. One night the two decided to confess. But ... Sarang got into an accident and passed away. The loney Jongin gave up on his dreams.

Months later Baek Millie, a girl that looks exactly like Sarang, enters Jongin's life. Jongin soon starts to fall for her not because of her looks but the way her innocence captured his heart.