18+End S Class

Sang-cheol has just returned to school after being discharged from the army. He tries to win over freshman queen Yeono, but…. “By any chance, is this your first time as a senior?” Sang-cheol, a virginal man with wounded pride, begs Hee-su to teach him techniques, and so begins a secret and special lesson! Hee-su and Sang-cheol’s sex lesson. In fact, the ending is…?