"Teacher. Do me. Sex tutoring." "What?" Joo In-woo, a former tutoring student who suddenly reappears after 6 years. With a fully matured face, body, and status, he intensely seduces his first love, Lee I-jae! "Teach me. How I should suck. How I need to suck for you—no, for women to like it." "Ha, ah, In-woo…" Agreed to out of spite after her ex-boyfriend's betrayal, thus begins their secret curriculum of sex tutoring! Chapter 1. Step-by-step starting from fondling Chapter 2. Theory is over, straight into practice Chapter 3. Advanced studies♥ . . . The lessons and the distance between them grow increasingly bold— A 19+ romantic comedy between a younger male student and an iron-wall teacher who progress from their bodies all the way to their hearts!