Kim Taeyeon,Kwon Yuri and Im Yoona are the best friends in the world since kindergarden.Then they became freshmans,they fell in love at first sight.The ones who stole the heart of the 3 girls are :  Jung Jessica,Seo Juhyun (Seohyun) and Hwang Tiffany.After that, Taeyeon,Yuri and Yoona watched them for a year but unfortunatly,they were not in the same class as them.But a year later,the 6 girls are in the same class.What will happen to them?