School of Youth: The Corruption of Morals(2014)

Original title: 청춘학당: 풍기문란 보쌈 야사

Troublemakers Mok-won, Ryu and Hak-moon are far from passing the state examinations. Three female students enter the school during a new spring term and the atmosphere changes. Then one day, Mok-won and Ryu are taken to around the back of the school and molested by an unknown woman. The three of them start an investigation.