There were 2 twin sisters. The other one is an Idol which is very popular and the other one is a school girl who studies at a school. Neither of their friends knew about this and only Yuri and Yoona are the only one who knows this. When suddenly the 2 exchange lives accidentally and decided to stay for awhile because someone might know about this. Yuri became an Idol and met SHINee’s Minho while Yoona, who lived as a school girl met Yuri’s best friend who was Taecyeon.