Namsun, Heungsu, and Jeongho are taken to the police station with their faces black and blue. Jeongho finds out the secret Namsun has been trying to hide. In the meantime, the principal orders compulsory attendance of voluntary study hall. Injae and Sechan stand their ground and declare they cannot follow the order. In return, however, class 2 has to raise the class average on the upcoming midterm exams.