Dan Dan grows up being told that her birth mom is dead but still becomes a hard-working young woman; one morning, she overhears her stepmom and stepbrother talking about something that sounds like trouble for the family; Young Guk is a single father.

Dan Dan takes Young Guk for a handsome psychopathic criminal, like in the movies, and she hits him in the head with her water bottle; Young Guk ends up with a gash on his forehead and is baffled by Dan Dan's plea for forgiveness.

Dan Dan gets hired to work as the live-in tutor at Young Guk's house, thanks to the help of Sa Ra; she gets into trouble on her first night on the job; Sa Ra gets invited to a fancy restaurant by Young Guk and begins to get her hopes up.

Dan Dan and Soo Cheol realize that they work in the same household and worry that their employer might think they are up to something suspicious; Yeon Sil tries to persuade Dan Dan to leave her position, but Dan Dan refuses.

Young Guk's strict nature with his kids makes his relationship with Se Jong worse than ever; Young Guk enlists Dan Dan's help to resolve the matter; although they bicker about the kids, Dan Dan's advice makes the kids grow brighter by the day.

Young Guk and Jae Ni fight when he mistakes Jae Ni's new friend, who happens to be a boy, as her boyfriend; Dan Dan helps the father and daughter make up, and Young Guk feels grateful; Yeon Sil's mom, brother and niece return from working abroad.