Jae-Won is reunited with his old classmate during a taekwondo lesson. But Jeong-Uk 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 Jae-Won 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...