Moon Yeon-su, a returning college student who gets completely drunk,
ends up accidentally entering the downstairs apartment on his way home-
the password just happened to be the same.
Inside, he witnesses a “union” (?) between his department’s TA, Yoon Do-a, and his classmate, Hong I-jae.

After the shocking scene, the night passes,
and the next day Yeon-su belatedly realizes the gravity of his own misdeed (?).

“…What the hell, it’s that pervert from yesterday?”

But unable to forget the pleasure of that night,
Yeon-su crosses paths with the two of them once again,
and thus begins Yeon-su’s chaotic and scandalous college life!