Title: The Good Teacher
Ahn Seunghyun is a great actor. He's also very talented in the bedroom. So, as somewhat of a joke, he decides to post an opportunity for people to learn how to be better in the sack, not expecting much to come of it, until he receives a drunken message from a college student named Hojun. As it turns out, Hojun was recently dumped because of his poor performance in the bedroom, and he desperately wants to improve himself.
Curious about the gullible and desperate young man, Ahn Seunghyun combines both of his talents and assumes the identity of Mr. Ahn, sex professor extraordinaire. To Mr. Ahn's surprise, Hojun is just as genuine and sweet as he imagined. Moreover, he is just Mr. Ahn's type, so he is more than happy to continue the charade, especially as he trains Hojun to be his ideal lover.
Unfortunately, as time passes and the lessons turn into dates, Mr. Ahn feels guilty. He has to confess that the class was a lie and that he isn't a sex teacher. But he could end up losing Hojun in the process.