Jae-hee, an international student facing both an academic warning and a breakup at the same time, picks up a suspicious self-help book to become a better man.
The first to notice this change in Jaehee is Miles, who is acting like a hot guy.
Miles buys the exact same book, wanting to be like Jaehee. Although reading it in Korean is difficult, he thinks he can do this much if it means becoming a man like Jaehee.
However, the book demanded physical 'development,' and the two end up crossing a line of no return