Punch Drunken Love

[From Kidari Studio's Penis Navidad Collection]

On Christmas, college student Jongmin was enjoying his time off, drinking and grabbing a one night stand. After a satisfying night, he turned on the light, only to find the one and only nerd in his department, Goo Youngho, next to him?!

“Why are you here?!!” Jongmin ran away after punching Youngho’s face, but Youngho followed him behind! What is the story behind this case?