Lee Tae-Young, a neighbor 's kid, who has lost contact with Jae-young lived alone in an old apartment building appears. Unlike Tae-young who is delighted to meet with his neighbor who was close to him when he was younger, Jae-young is somewhat uncomfortable with his neighbor's kid. Will the old grievances be remembered or will the new ones be born? BDSM passion, triangles and more in the room "1305".