Sunny , a girl who's friendly and cute . Sowon & her are both good friends when they're 7 years old .
After a few years , Sowon moved house and transferred school . Tiffany and him get to know each other when they are 16 years old. 
That day , Sowon and Tiffany was together when they met Sunny when he's shopping in "Shop 2 Laugh" .  Sunny & Tiffany both fell in love with Sowon . Who will be Sowon's choice ?