A touching story of two completely different students from two completely different worlds. One is a rich male repeating his third year of high school and the other a poor girl in her second year of university struggling to make ends meet.

Mrs. Hong Duk-ja quits the Mafia and starts a food company, but an incredible case occurs when she goes on an overseas trip to Japan with her family.

A boisterous detective goes undercover in a high school in order to befriend the teenage daughter of a notorious gangster.

Nineteen-year-old, Jin-goo enjoys an erotic moment to himself while thinking about his pretty English tutor. Then one day, he is caught in the middle of an embarrassing moment and becomes awkward with her. However, this becomes an opportunity and she starts teaching him sex. Their replationship becomes an uncontrollable romance. However, she quits the tutoring and the relationship to get married. Time goes on and Jin-goo is a grown up. He's used to thoughtless sex. However, his partner of benefit gets pregnant so he meets his future-mother-in-law to talk about marriage. However, she's so beautiful and sexy. He moves in with the in-laws but soon breaks out of the marrige due to his wife's fling. The mother-in-law doesn't know how to make it up to him for what her daughter has done. Jin-goo suggests something dangerous...