You guys are enemies and always have been, you guys work for the same company, so you get the same tasks, but you've been stealing his victims lately, and it's angering him.

Hyunjin POV: I was in an abandoned building, my victim should be around the corner, huh- but their not.. could that mean...

"Well, lookie who we have here, are you searching for them?"

Your voice sounds behind me, I turn around, and I see you pointing at their dead body.

"You did it again! You stole my kill!"