Murphys is a killer, a bloodthirsty killer with "powers". But he is also a realistic killer. He has no father or mother. He has struggled from the bottom of society to now being able to accept tasks alone. He said that this was fate, and since God chose him, he must live faithfully.
Vin is an indifferent police officer who is efficient and has the trust of his superiors. He has "ability" but suppresses it because he doesn't want to rely on it. After three years of arresting Murphys, he caught him by chance and locked him at home for a special reason.
Murphys said, I hate you, but I love you, even if one day your bullet is in my chest.
Vin said, I love you more than I hate you, so if you can't hold the knife in your hand, I will hold the gun in your hand instead.
Fate is that sudden encounter.
So what if there is no recovery?