Rich Do-won lives off the libido of a sexual plaything girl named Yoo Min-hee. One day, his elder brother, Dae-ho, is kicked out of the company after his brother's business went bankrupt and he was raising money here and there. Dae-ho visits his wife Seong-ah and borrows money from Do-won. But he can't even pay back the interest and ends up being a fugitive, and Do-won takes advantage of this opportunity to approach Dae-ho's wife. After such a hard time, Dae-ho and Seong-ah run away. However, Dae-ho dies after being caught by Do-won, who was waiting in advance, and takes the baby home alone. As time goes by, Seong-ah's body heats up and wants an active relationship, and then Do-won's unconventional demands increase. And then one day, her husband who she thought was dead, came to see her.
In the 1980s, Hyeon-soo, who is from a rich family but causes all sorts of trouble, barely makes it out of junior high and makes it to the next grade where he steps out of the 'Hurricane's' line.
Are we dating? Even if I slept with her? Is it alright for friends to sleep with each other? Pretending not to know, pretending to know all the flirting going around. The flirting goes on any time and at any place! Today with this one, tomorrow with that one and who knows who the day after...
"Trust me tonight" Min-ho is preparing to get a job and is spending some time in his parents' house. However, his parents aren't home and only his young sister-in-law is there. His brother Hyeon-soo had left the house after fighting with his wife. Min-ho can't help but feel attracted towards his young and appealing sister-in-law.
Jong-hwan's friend's daughter Seong-hye moves into his house. She messes up the house and drinks with her friends and even has sex with men in the house. One day, Jong-hwan ends up comforting Seong-hye who broke up with her boyfriend. They spend more time together and become dependent on each other. Afterwards, they fall for each other more than they should...
