A married woman with a garbage bag in the elevator and a college student with a major book. Really, romantic is a moment that you can't even find after washing your eyes, but Tae-joo felt quite erotic at that moment. So I knocked on the door of Siwan, the college student who lives next door. 'I like it.' 'What?' 'That look on your face, it's quite my thing.' Siwan liked this moment inside. I fell in love with taejoo naked body, who was having a good time with her husband on the veranda even in the middle of the day. And Sieun, who dreams of a strong love that will never be forgotten by someone 'Professor Yoo, I'm interested in you.' 'I'm not interested in students.' 'Lie. You've been watching me throughout the lecture." Professor of philosophy and Taejoo's perfect husband, Dojun. The stubbornness collapses, and Dojun begins to give his body and heart to Sieun. Who is a really bad X?