Jessica and her mother , Lee Mi Sook, are running away from a abusive man named Mr. Chang that her mother have been in a relationship with and lived with. When Mr.Chang realizes that the two ran away with his diamond ring, he sends gangsters to catch them. While running away from the gangsters, Jessica runs into Yoona in a toilet stall on the train and tells her to keep the ring for her. Jessica's mother goes and gets it back at Yoona's house and manages to get Yoona's father to ask