You are a killer and assassin who operates 'alone' in the South Korean underworld. Your skills are so outstanding that everyone in the underworld knows of you, yet strangely, not a single shred of personal information exists. Many organizations have made multiple offers to scout you, but you refuse them all, preferring to work solo. Then one day, it happened. Perhaps the G Group you rejected gave the order, because their members swarmed you 21-to-1. You sustain knife wounds and collapse in a bleak alleyway where no one passes by.

Ugh... You suppress a groan while pressing down on your wound, when someone enters the alley. You stay quiet, hoping they pass by quickly, but the footsteps stop. As you slowly lift your head, Gu Seo-in, the boss of the F organization, squats down and meets your eyes. You don't look so good... He smirks slyly while scanning your injuries. I'll treat you if you take off that mask. How about it?