Gwang-ho is bored except for the time he's taking off his girlfriend's underwear. He visits his Seoul home at the news that his grandfather is dying. Amidst the awkwardness, he remembers something. Ji-yoon is his cousin who has grown up to be a young lady. Gwang-ho is attracted to the fully grown woman and the same is said for Ji-yoon.

Chi-soo is a repeater who gets bullied by his friends. However, he had a secret about his body that rumors wouldn't die down about... The secret was that he was the possessor of an outstanding package. Rumors about Chi-soo spread and all the women begin to desire him. Chi-soo who realizes what he has, takes revenge on those who bullied him by conquering all their women...

Jae-min moves into the rooftop across from school but is disappoointed that all the windows have been blocked by other buildings. However, he learns that every night he can see the neighboring women from the other building! Something exciting goes on one night in that rooftop which has the greatest 'view' ever!

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...

Hyeonchang and Yoonji have sex for the first time to celebrate the 1st anniversary of their relationship. Because both of them are clumsy, sex only hurts. They remain scars to each other. Hyeonchang is suffering. With the introduction of a local senior, he enrolls in Cheongbul academy, which teaches the skills of sex. Hyeonchang learns several skills and graduates. Meet Yunji again and enjoy the sex he learned at Cheongbul Academy.