Choi Seunghyun and Jang Hyunseung were childhood friends, and they did everything together, throughout Elementary and Middle School, they were inseperable.

One day, the two were crossing the street, and a huge truck was coming, but Seunghyun didn't see it, so Hyunseung pushed him out of the way,  Seunghyun was safe but it was too late for him.

Now, after high school, Seunghyun has changed so muhc and Hyunseung just wants his friend back.