The S in SM stands for Service

※The text contains illustrations. Professor, please tell me what you want me to do. Timid professor Yoon Chi-won indulges in a masochistic sexual fantasy right before class starts and rushes into the classroom. After class, Chi-won realizes that he left his cell phone with a pornographic screen on it on the podium and is left in a state of deep contemplation. However, the phone is already gone, and his secret is no longer safe on campus. While he is trembling with anxiety, a student named Im Tae-hyung appears and confesses that he found the professor's phone. Unable to lie to him anymore since he has already seen the phone, Chi-won has no choice but to reveal his true self to Tae-hyung. A...