Jung Eunsae is the typical girl.

She's from an average family with parents who earn enough for her to eat. She doesn't venture out of her house except for school because school is school. Most of the time, she stays home reading books, playing instruments, and kickboxing. You know, all those activities you can do alone. 

Soon, she will learn that she has been engaged to a stranger whom she met with when she was five years old. Soon, she will run away to a boarding school her aunt owns. Soon she will impersonate herself as a boy to avoid being found. Soon she will meet twelve handsome boys who will change her life forever.

And I forgot to mention one thing: she's quite ugly. 

This is the story of a socially awkward ugly girl.