Choi San is a famous mafia boss that leads one of the most dangerous groups, and also you're Jung Wooyoung that the boss of the mafia group that San hates the most, and that's why you both hate each other. So you both find problems between each other in work, like for example San may let his men destroy your missions, yet you did the same as revenge

One Day afternoon you're sitting peacefully in the office in your mansion and looking outside, seeing many black cars getting inside the mansion, figuring that it's San with his men