Two sisters Sissy and Missy are moving to a new continent, a new country, a new city, and most importantly... a new school. Sissy's a super smart, super sweet girl that is loved and protected by friends and family (especially by Missy). The thing is, Sissy's the typical wallflower. Sure she's always invited to parties (by Missy of course) and yeah she got some game but still, no one really remembers her. Missy is the sassy, outgoing one who loves to party and have fun!  Though she seems cold shell do anything for her sweet little twin sister. What'll happen when they both fall for the bad boy genius Myungsoo? Will Sissy back down? Will Missy back down? Or will they both fight for Myunsoo's heart?