YoonAh is a childish and adorable girl.She has 8 bestfriends,Yuri,Jessica,Tiffany,Hyoyeon,Taeyeon,Seohyun,Sooyoung and Sunny.YoonAh just back from Japan because she has some work to do there.Her friends celebrate her returns at the airport's cafe.The cafe is the place where YoonAh meet a boy from Mokpo named Donghae.