Mafia.

What first comes to your mind? Killer? Monster? Threat? Danger? Have you ever once considered that Killer's can be Killer's for a reason?

Well youre lucky. Because mafia's here kill the people who need to be killed. Those who are a threat to the human society, Physically and Mentally.

The Jeon clan and the Park clan is the head family of the two best and most notorious group of mafia's in North and South korea. The two had always been allies and if these two clans decide to merge? They could rule the world. 

However, when an old enemy comes to plot their revenge and yearns to see the both of them crumbling down, They figured they should reconcile.

Through this process, who would've thought that both clan's first son's would fall inlove?