Ki Moo-Hyeok (Yoon Gyun-Sang) is a lawyer with a high winning rate. He 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.

In order to regain his good name as a lawyer, he sneaks into the high school and begins to work as a temporary teacher. He tries to reveal a secret which the students have. In so doing, Ki Moo-Hyeok gets involved with Teacher Ha So-Hyun (Keum Sae-Rok).

She is P.E. teacher who loves her students. Ki Moo-Hyeok and Ha So-Hyun then face the students’ secret.