Han Si-woo spent six years living as the kind of guy nobody noticed.

After years of relentless training, changing his appearance, and rebuilding his confidence, he finally enters high school determined to enjoy the youth he never had. No more being the forgettable nice guy. This time, he'll live like the confident "alpha male" he always wanted to become.

It works a little too well.

A chance encounter after another soon snowballs into a series of misunderstandings involving four wildly different girls, and even a hopelessly awkward rookie teacher. Before long, Si-woo finds himself surrounded by jealous rivals, explosive catfights, bizarre club activities, and enough romantic chaos to make every school day a disaster.

All he wanted was a normal, popular high school life.

Instead, he somehow became the center of the most unhinged romantic comedy imaginable.