Ki Moo-Hyeok, a lawyer with a high winning rate, only cares about money. Due to a murder case at a high school which he deals with, his reputation as a lawyer hits rock bottom. To regain his good name as a lawyer, he sneaks into the high school and work as a temporary teacher. He tries to reveal a secret which the students have, and gets involved with Teacher Ha So-Hyun, a P.E. teacher who loves her students. They then face the students'secret.

• Yoon Kyun-sang
• Keum Sae-rok
• Choi Yu-hwa
• Lee Jun-young
• Choi Kyu-jin
• Han So-eun
• Joo Se-Bin
• Jang Dong-ju