Jihee, who is attempting her third year of college entrance exams after consecutive failures, begins private tutoring sessions with Yuhwan, her mother's friend's son. However, unlike regular tutoring, these sessions involve corporal punishment if she is late or fails to do her homework. “Jihee. What were you thinking to forget our tutoring time?” “...I’m sorry. I was just trying to clear my head at a cafe and... I lost track of time.” “What were you thinking about?” “...I’ll just take the punishment and end it.” What means will he use to pry open the lips of Jihee, who is biting them shut out of wounded pride?