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.

Mi-yeong wants to take revenge against her husband who ignored her and told her she is not tasteful to him; he even went ahead and had an affair. She is determined to sleep with any man who is available. And she also ends up sleeping with Bok-hee as well, a single virgin man who is currently writing an R rated web-toon. For revenge, for pleasure and for making a living, these women have to see men no matter what! The intimacy marital harmony of the three women, who want to have it well even though it would mean only once, is revealed now.