"Do not leave the house. Take medicine and go to bed when the sun goes down. Do not touch locked doors." Jae-jun, who had always followed his father's rules throughout his life, begins to break them one by one as he enters puberty.

집밖을 나가지 말 것, 어두워지면 약 먹고 잘 것, 잠겨 있는 문은 만지지도 말 것. 재준은 평생 아버지가 정한 규칙을 지켰지만, 사춘기가 오면서 하나씩 어기기 시작한다.