Kim Seohyun is a 16 year old girl who is sweet and innocent , she seems to be happy all the time but she kept a secret that haunts her until now . Their parents died to save her ,Seohyun is 9 years old when that happens , Seohyun and her sisters kim taeyeon and kim tiffany / kim mi young were just 2 years apart , Taeyeon and Tiffany are very protective of her sister ,three of them wanted to be a singer but what happens if they each suddenly meet th