One is that the first operator, Mu Ling, gets her identity completely exposed early on, while other operators no matter how distinctive their abilities aren't ever exposed. Like a certain magician, particularly. The main issue here is that no one seems to even question it.

Another is that the author uses Bai Yan's functional insanity as a free pass to have the guy do pretty much whatever the author wants without any buildup. It's also uncomfortable seeing a protagonist whose first impulse is killing, and who regrets when someone hasn't done enough bad things to give him an excuse to kill them. Other people say he has a moral bottom line, but he's really thinking that the entire world, good and evil, will hunt him down if he crosses the line. Including his operators. No, I get that it's just his personality, but the author hid how bad he was until he was suddenly massacring thugs left and right to grind for exp and loot.

Another is about the outer god who was paying attention to him suddenly intervening after he used his prior knowledge. He just went "oh shit, that happened" and then ignored the possibility of it happening again while continuing to use his game knowledge.

He mentioned that the game probably wouldn't let him use a luck increase card for better gacha results, but then proceeded to abuse loopholes all over the place. Based on what I've seen the game allow since then? I'd assume the card would work.

The library of ruina possesses all knowledge of past and present. But Bai Yan has only used it to enable powerups and didn't even consider using it to figure out his connection to the outer god, his missing past, etc. The operator looking for a missing best friend didn't even react to something that could outright tell him where the guy is. Making it worse is the fact that immediately after finding out about the library that knows everything, said operator commissions another operator for information instead.

Oh, and in addition to being able to know anything knowable, the protagonist also has a 1/week instakill weapon that can target anyone in the world. Why doesn't he use his knowledge of the future to deal with the more dangerous enemies ahead of time? I'm sure there are good reasons, but he doesn't even spend a sentence considering it.

Bai Yan begins as a transmigrator from Earth into a similarly modern world where the supernatural exists. Although rather stable and sort of nihilistic, as the plot moves forward he begins to progress into a different mindset. He generally wants to see the pain of those he deems evil, which gets more intense as time goes on and his scope of 'violent thoughts' broadens.

At first, the only hint of this transformation is the man at the DHA, Lin Bian, who dislikes the MC because he "smells of madness." Later on, Bai Yan realizes himself that he's getting more abnormal thoughts.

Towards the chapter I left off on, there's a suggestion made that he went back in time after he failed to (???), but he doesn't remember.