You [Gong Mae Lee] Play As Gong Minji's Younger Sister. As of The Beginning Of The Story Minji Realizes, That Her Boyfriend [Lee Seung Hyun] Seungri Belongs With Mae Lee, From The Way They See Each Other. And Remebers That Minji & Seungri, Have A Akward Relationship, So Minji Gives Up Her Relationship With Seungri And Gives It To Mae Lee.