Korea. A place full of crimes with, of course, mafias. The president had stricly forbid music or dancing in the country and that was one of the cause of how people became a mafia and got involved in lots of crimes. They had to rebel eventually. Robbing banks, killing, hidden clubs, prison, luxury. It was a part of their life. 

With their positions, EXO held the position as Korea's top gang, followed by the only female gang Red Velvet, and in third position was ANON. ANON had always wanted to destroy EXO so they could be the top male gang, and ANON decided to team up with Red Velvet to bring EXO down.

Unfortunately, EXO and Red Velvet had a journey infront of them together.