Hyerin and Sehun are Bestfriends since Childhood, They keep a Promise to each other, and that promise will be broken by just One thing, and that one thing is also Love, they always hang out. Hyerin has a Brother named Chanyeol. Chanyeol has a Girlfriend which is a foreign named Thea, Lee Thea, Thea also has a Brother named Jihoon/(woozi), Thea always understand Hyerins feelings, She treats Hyerin like her own sister. "Sorry Hyerin-ah....but I only think of you as a Bestfriend...but you know that I loved you right?but...I have someone else now"