Jaewon is reunited with his old classmate during a taekwondo lesson. But Jung-wook is no longer the timid dork from school. Instead, he’s a fully-grown hunk who’s huge in more ways than one! It’s clear to Jaewon that there’s animosity between them, but why? And how come he can't recall if they were friends or enemies? It’s all so hazy! After class, a fall in the shower causes Jaewon’s lost memories to begin trickling back to him. And the question, “Did I do something wrong?” sets the two old classmates off on a steamy journey to recover Jaewon's forgotten past…