The friend Cheong Ah plans to meet at the train station is Joon Kyum, a boy from a well-off family. The two teens plan to commit suicide together. They enjoy their last meal together and return to the small room they have rented, where Cheong Ah falls asleep. When she wakes up in the middle of the night, Joon Kyum is gone and only a letter remains. Cheong Ah calls her mom for help, who tells her to make everything look like an accident.
영웅 치킨집 세 딸 중 재벌가 입성이 목표인 맏딸 설아는 오지랖만 넓은 고3 여동생 청아가 답답하기만 하다.
청아는 사실 학교폭력에 시달리고 있었고, 급기야 온라인에서 만난 남학생 준겸과 동반자살을 하러 구둔역으로 향하는데..
