Given that he possessed the body of a boy who's mother was repeatedly and brutally raped in front of him when he was a child and all the rage that is fueling his very existence, there were a lot of more interesting paths the author could have taken. For example, he could give the MC a bipolar personality, calm, meticulous and aloof some times, and brash, spiteful and enraged at other times.
IMO it would have been much more interesting to see how that might've actually fueled his growth as a person. Instead, he's the perfect pacifist who barely utilizes violence to solve a problem despite violence sometimes being the only way to solve the problem.
He took what was basically 3 lifetimes to take care of a single village chief, which is stupid beyond belief. He justifies it with monologues about how the government will investigate and the like, but truth be told, he doesn't even make sue of his perfect future knowledge to even strategize a way to kill the chief without being involved. Hint: Leak to the Moorim all the secret silver he has left and hide yourself when you do it so no one knows who leaked it. That would've solved the problem and the government wouldn't care because he was hiding money from them too (he deserved it).