“I won’t make you lie on the bed, so don’t worry.” Sei visits the house of a chairman's wife, who is a friend of his mother, for the first time in his life. He is asked to tutor the so-called troublemaker youngest son, and on the second floor, where he goes to check on the student, he witnesses the beautiful back of an adult man. The problem is that he not only witnessed the back, but also the man's gaze. He is suddenly treated like a pervert, but Sei eventually completes his mission, and Mom's friend makes another secret proposal after seeing him. That is to watch over her eldest son, Tae Seung-joo, and tell her about it. Her eldest son, who looks perfectly fine, is failing at being a 'man', and is even a virgin, so she wonders if there is something wrong with him and sends Sei as a spy. Of course, Sei was too unskilled as a spy, and only awakened Seung-joo's vicious instincts after he found out everything. “You don’t mean you’ve forgotten how to wash up because you’ve lost your memory, do you?” I don't think I need to observe this closely, but I'm sorry, Madam, but your son seems to be a little crazy...