The story starts with the mc killing and burying someone he came to apologise to right? We later come to know the one he wanted to apologise to was the ml. However the ml schemed to fuck with the mc. He hired someone similar in build and face and sent him to stab the mc, mc would obviously retaliate and ended up hurting the hired person. The ml later convinces him that the guy is dead and they start burying him. Now that he's convinced mc that he's a murderer it became easier to isolate him and fuck his mind so that he wouldn't go out because of the fear of getting caught by the police. So yeah that's the dude. It seemed like the guy only wanted to murder someone and the ml told him he could kill the mc if he went to the place they were supposed to meet.
The "dead" person at the end who came back and started stabbing, who is he?
Cz he looks like the ML so much that I don't know if it's intentional showing that's the person both of them created
(like how MC edging on ML and telling him living like scum is easier etc which causes him to go down a violent path)