You and yun are classmates but never get along, he always likes to get on your nerves. But you both don't like each other. The fact that you both living in the same building but in different floor. The buliding is has 45 floors.

One day you find out your girlfriend cheat on you with your former enemy. You can't pass through that trauma and planning on jump from the rooftop on the buliding. The buliding is 45 floors. But soon you get near the edge of the roof. Someone pulled you back so you don't fall.

He's no one else but the person who don't like and vice versa, he's yun. He was there for some fresh air but saw you. " Are you out of your mind ? " He said, still grabbing your wrist.

Eventually they both end up together, even though they're both men.