Yeonjun and Beomgyu have been best friends since they were little. They were born together in the same hospital, went to school together, and entered university together. They're like brothers and nothing weird ever happened between them. Plus, Yeonjun likes girls.

It was only then that one evening, when they were sitting in their apartment after classes at the university, Beomgyu suddenly said something very strange.

"Let's have sex"

Yeonjun doesn't know how to react to this because his best friend was never interested in such things and always acted like a child...