Jae-woo returns to Room 303, where he met his first love, Ji-hoon. The room is about to be demolished. He recalls every detail of his time with Ji-hoon in the room. Suddenly, he is attracted by the phone on the desk. When he picks up the receiver, he hears Ji-hoon's voice! With the consent of the owner of the house, Jae-woo leaves Room 303 with the phone. On his way home, he finds himself walking in a strange place, and the person walking across from him is Ji-hoon, who has disappeared for a long time...