Yeong-hoon is a 13-year-old boy who leaves his house not being able to stand his father’s abuse anymore. He has no place to go so he takes the subway to Oido and there he meets Hyeon-soo, a orphan the same age as him. Hyeon-soo has already been to the Detention Center for Teenagers and his rough actions causes Yeong-hoon to feel aspiration and depend on him. One day, Hyeon-soo’s girlfriend Han-na gets pregnant so Hyeon-soo and Yeong-hoon heads to Seoul Station, where rugged kids like them live in a group..