1. MC finds out that the sister of the person he is bodyguarding is being blackmailed by some dude and it will definitely become a threat to his client.
2. MC tracks down the blackmailer, jumps on him waving the gun and shouting threats in the public place, in front of possible witnesses at the daylight.
3. MC belives the blackmailer's word that he gave him everything he had for blackmailing and there are no other copies left.
4. MC in all his glory goes off to the sunset, while girls around him are shouting hooray and throwing their panties at him.
B-but... What if the blackmailer accuses the MC of an armed assault and find the witnesses? Won't it be a little problem for MC's mission? What if the blackmailer wasn't being completely honest with the MC and he still have something he could use to harm the guarded person? What if there was something more than just an ordinary blackmail? It looks like the answer is NO, and such a professional as MC shouldn't be bothered by these stupid questions at all, so shouldn't be me.