Boo Shan-Ray, 18 and Boo Seugkwan's little sister. She moved to LA only at 15 for school and hasn't seen her brother since she left. She returns home only to run into an attractive boy who just happens to be her brother's best friend. Seugkwan gets really protective over his sister, Shan-Ray keeps secrets from Seugkwan, but does Seugkwan find out or not?