Sunny, Taeyeon, Jessica, and Tiffany were best friends living in Busan with Sunny's parents. All girls' parents are rich. Sunny's are owners of many companies and buisnesses for example, Sunny Look, a makeup line that became so popular that it is a magazine now too. Tiffany's parents are the owners of Tiffany Co. and Jessica's are the owners of Jessica Jewlers. Taeyeons's parents own Tae Tailors, a wedding dress shop that has high quality dresses by many designers. But one day the girls' parents thought it was time for the four of them to learn to became independent and be good at taking care of esponsibilities so they came up with the plan to send them with Sunny's brother Donghae and his best friends, Leeteuk, son of Park Watches, Sungmin, son of Sungmin Amusement Park, and Siwon, son of Choi Education. You'll find that the eight to grow up and grow closer. You'll see them fall in love. You'll find out the love is difficult, but not impossible.