Three nights before enlisting, Seung-wook decides to leave his mark since he can't avoid the military so he flirts with everyone. However, his school senior So-yoon nor his blind date Il-hong will fall for him. The night before he leaves for the army, Seung-wook decides he's going to see some action with the two girls. The project of 'leaving a mark' starts now.

A 25-year-old mother's solo index, dreaming of a pure, good love of white color. Her unrequited love partner is the owner of a passionate and free sex coffin. One day, the index happens to meet my friend Sujin. Sujin is a college sex story telling the story of the index stimulates the index is not good, but the quarrel with Sujin, Sujin is constantly worried about the words. In the end, the index makes a plan to spend one night with Ch'an in order to have confidence in Ch'ing. And finally , I'm tempting Jaejoong. "Sir, I'm ready now." "Ready ... I'm ready." Shall we play hard tonight?

Nam-geun is having sex with the youngest female employee at work every lunch time and Kim is learning sex from a married superior. Lee is going around, poking everyone here and there. All of them get horny once work starts. One day, Hee-soo, the sexiest worker, comes back from China and she's become even sexier. The male workers start to beg her for sex...