Minjae is a highschool teacher during the day, but at dusk, he goes out on the streets and join with youth who are alienated from school and home. Due to an incident, Minjae is put to the test again to protect his students ─ Jigeun and classmates.

Sophia, a smart but quiet high schooler, strikes up a friendship with a new girl in class, but the girl begins to disrupt the lives of Sophia and her family. Sophia is then forced to uncover her friend's past and learn the truth before it's too late.

On their last day of summer, four high-school girls confront sex, violence and their uncertain future as they struggle to reconcile a rebellious youth with impending adulthood.