Lee Keira is a girl who changed when someone adopted her. Because of this, she became quiet and observant. Her whole personality changed the moment the adoption contract had been signed.
BTS, an international famous boy group, has problems with their safety. They have received a threat and is told that they should look out for themselves as darkness just lurks around the corner. Keira is hired to protect them and fight for their safety.
Throw in one girl and seven famous boys in the same apartment and watch as the story progresses.