Donghae , Kibum and Kyuhyun are sons of infamous underground boss "kangin" and his spouse leeteuk. Although kangin is  known as a cold blood monster and fear by many , he's really kind and gentle toward his family. His family's safety was always the  first property for him. His family identity was well hidden from anyone beside their gang.  But there's no secret that last forever. One days his nightmare began w

2 brothers were separated during the tragic event in their childhoods. After 13 long years fate make them encounter each other. But can they really accept each ones again as their loved brothers now when  one become a police agent when the other is a top assassin.