Taeyeon has three bestfriends name tiffany,jessica,and seohyun.Until one day they went to a store to buy something.Tiffany picked a doll until the owner whisper to taeyeon.That doll is a ghost so you dont want to buy it or else it will kill you on the 15,thats the dateowner said.Also their is two boys name baekhyun and chanyeol who always mean to the girls.