Good Mother: Coveting My Father's Woman

Seong-su, who is heartbroken after losing his lover to his best friend Dong-ho, is comforted with all his heart and soul by Yeo-jin, an older woman he meets by chance. Falling in love with her mature consideration, Seong-soo starts dating Yeo-jin, saying it doesn't matter whether she's older or married. But what is this? It turns out that Yeo-jin was the stepmother of her old best friend Dong-ho! The ex-girlfriend she loved passionately. her best friend. She is the mother of a friend who has come to love her the most in the world.

A young man is suddenly stuck with his mother's friend after a financial crisis gone bad. The woman is his first love and her beauty captivates him. She, in turn, sees him as a grown man and their love grows.

20 year-old Hyun-yi falls in love with his 40ish female boss, Sook-hee who is his father's long time mistress. But who is she indeed?