Jeon Somi is a teenage 17 year old girl who moves to  America and goes to a new school. Her parents divorced so she decided to move to America with her mom. She meets great friends there, such as ten awesome girls, known as I.O.I (아이오아이) and they let her be in the group. They are the most popular girls in the school. And then she meets a boy named Lee Daehwi, who is totally charming. But what Somi and her friends don't know is that Lee Daehwi and his group of friends, Wanna One (워너원) are vampires. What will Somi do when she finds about the secret? Will she accept it or will she never meet Daehwi again? We'll find about it soon!