My Girl

My Girl (마이걸) is a manhwa series by Jeong Won Paek.

Plot
Jinny is a popular, upcoming model with gorgeous long black hair, but little does everyone knows that she is in fact actually Ahjin, a high schooler who has short hair, wears glasses and acts like a tomboy! As her father would not approve, she does modeling secretly with the help of her Uncle.

Ahjin has a crush on Dohoon, one of the coolest guys in school, and when Ahjin (dressed up as Jinny) finds out that she'll be living in the same building as her crush, she's thrilled! But how can she keep her secret from Dohoon, when he insists on pursuing the model Jinny?!