Sangcheol who had just returned to school after finishing his military service. He tries to win over the freshman queen Yeonoh, but… “Could it be your first time, sunbae?” The virgin Sangcheol who had his pride hurt, begs Heesu to teach him some techniques. That’s how the secretive special lessons start! Heesu and Sangcheol’s sex class. How will it turn out…?