Stray kids was one the biggest mafia groups in Korea. They were seen as cruel people and vile with no mercy towards their victims. But on the inside they were close like a family. Bangchan who was the leader. One day they all had a mission to take down another mafia group. As they were destroying the place. Felix found a cell that held a child who turned out to be a vampire locked inside and hurt.. He took her to the group and they all agreed they would keep her as their own.