A sexual scandal between a math teacher and a student in a prestigious high school ended in tragedy. 4 years later they meet again, now as adults, to reveal the corruptions in school and to regain one's reputation as a teacher.

• Lim Soo-jung
• Lee Do-hyun
• Jin Kyung
• Woo Da-vi
• Jang Hyun-sung
• Byeon Jung-su
• Choi Dae-hoon
• Baek Ji-won