Now here is one person who tells the inconvenient truth to children. Ma Yeo Jin also takes it one step further. She perpetuates the ugly side of our immoral society by becoming a controlling and manipulative teacher. In class, the students are taught what behaviors to adopt in mock circumstances that reflect actual life. Her students are instilled with fear, stung by hurtful remarks, and betrayed by classmates under Ma's manipulative ways. But gradually, the students learn to become independent and self-reliant. (Source: MBC)