Namgung Sang is a very clean guy with a stable job and elegant hobbies. But to the other people, he's just a hysteric, old bachelor. Somehow he ends up sleeping on the same bed with Manager Lee. Nothing actually happens, but he begins to have a bad feeling. And there's another girl, Yu Ji Na, who's very young and cute. To allure her into marrying him, he goes to the amusement park with her and even lies to her father. But he ends up getting into big trouble.