Class of Lies

Series is a 2019 Korean Drama Class of Lies Starring Yoon Kyun Sang, Geum Sae Rok, Lee Joon Young, Choi Yoo Hwa, Choi Kyu Jin, Han So Eun, Kim Myung Ji and Jang Dong Joo.
Also known as: Mr. Temporary / Undercover Teacher
Air time: Wednesday & Thursday 23:00

Plot:

This is a drama that criticizes the mild punishment of teenagers who commit intense crimes in school that are just as bad as those that occur in society.
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.