Do-kyung struggles to get ahead, while Byeong-tae already fell behind a long time ago. A dejected youth, Do-kyung juggles her studies and part-time work at a convenience store. Meanwhile, Byeong-tae is burdened by his mother’s hospital bills. Just when he sees a light at the end of the tunnel, Do-kyung ruins everything. An inevitable showdown between the two begins.

Hyun-woo’s friend celebrates his birthday and brings the gang to a cheap motel. Hyun-woo, carried along, follows his friends. He enters room 305 alone. After a while, a woman enters. He is shocked and runs away. But he can’t stop thinking about her.