1 foreigner on an exchange program. How hard can her life be?

Lee Jaehi and Park Heejin are childhood friends who have been called the siamese twins cause they're always together. They share everything they had. Ever since Jaehi was brought in by Mr and Mrs Park when her parents died from a car accident, she has always been grateful and vowed that she will repay them when she is able. She'll do anything, for their happiness. Even if it means forsaking her own.