Song Hye Mi (You) is normal university student in her first year. Her hobby is climbing mountain, she love natures and always climbing mountain with her friends. But one day she got lost in mountain alone, separated with her friends. Luckily Choi Seunghyun also climbing in the same mountain with Hye Mi and saved her. After that day they like each other and start to dating.

BUT

Hye Mi has a secret: SHE ADDICTED WITH MAN’S BACK. Her previous ex boyfriends broke up with her because of this problem, they said “You like my back more than like me as your boyfriend, so today we broke up” OR “Why did you drool just looking at my back?? Eww you weird~~” OR “Did you ‘sick’?? Why do you like man’s back?? Go to psychiatrist!” Because of those problems she decided not too addicted with man’s back, but since she has new boyfriend she’ll keep this secret with Seunghyun. The problem is, can she keep this secret from him??and have smooth happy relationship with him??