After Jae-won goes back to school, he can't find a place to stay so he ends up renting out a room in his mother's friend Hee-jae's house. Hee-jae's daughter Yoon-young has grown up to be a mature young lady. One day, Yoon-young uses school exams as an excuse to stay over with her boyfriend and Jae-won brings his girlfriend to the house. Hee-jae thinks something is going on and interrupts. Meanwhile, Yoon-young is not entirely happy with sex with her boyfriend and has other thoughts when she sees Jae-won. She starts seeing him as a man. In the end, she calls him to her room in the middle of the night...

Young Mother's Friend

Yoon-yeong failed her university entrance exam twice. Her mother provides her an English tutor since her grades do not improve as expected.  However, the tutor goes to Yoon-yeong’s mother, Hee-jae, and then Hee-jae’s younger sibling, Yoon-joo, likes the youthful and handsome tutor.  Eventually, Yoon-joo plans to seduce the tutor, Yoon-seong by making her sister and Yoon-yeong leave the house.  The tutor knows how Yoon-joo feels, but he still keeps on thinking about seeking Hee-jae…