My Love Patzzi

Song Yi is a girl with a pure heart with a bad temper. She was tricked and humiliated by her "best friend" Hee Won as a child. From then on, Hee Won has always been the princess and successful while everyone mistook Song Yi as the evil child. When Song Yi did not have a job, Hee Won introduced her to the amusement park that she is in charge of. There she found her childhood friend and ex-crush Hyun Sung, who Hee Won has "stole" when they were kids. (mydramalist.com)