Felix had been unevenly attracted to older men since his senior year. Fortunately for Lix, Hwang Hyunjin taught them mathematics. Every third person, whether it's a guy or a girl, fell for it. And Felix was no exception.

Hyunjin was a good eight years older than Felix. However, having almost changed his fourth decade, like expensive wine, Hwang only got better over time. That's why, from the very first pair, Lix couldn't take his eyes off him..

"Felix, you're staying for the retake..~"