Warlock of Oceans: My Poseidon System

tl;dr - Inconsistencies and very little is explained. Heavily recommended not reading. Inconsistent Magic Stat and MP. Magic Stat went from 5 to 15 after a 1 year timeskip in which he became a 3rd rank (star? circle? idk) mage and did nothing else during that time. The literal next chapter, the Stat is 5. Then he leveled up a lot and classed up (He reached a level threshold and got a class). The class added "+8" to the Magic Stat, and after getting the class, the Stat was 13. It's also not explained what leveling up does since he doesn't seem to gain any Stat points. During this time, his MP has gone from 15 to 10. Oh, there's also a random well in the middle of a big city (which is later explained to be a dungeon, but if that's the case why is no one guarding it or going into it in an entire year? (1 year timeskip in which he stays near the well for the entire year) And the MC doesn't question the well at all. MC is also supposed to be some smart, really powerful Mage dude before he was killed and went to the new world and yet he attacks someone bc they have a cool looking gold mask and he wanted it. He already had a black mask. It's been explained that masks cost money, and the poor can't even wear them. This is also a fantasy world where he saw a dude get killed soon after arriving, and nobody even looked in the direction. So it's safe to assume the rich are also very powerful. And it'd be a pretty simple conclusion to make that a gold mask costs more than a plain black one. So even though he's barely any more powerful than before, he attacks bc he wants the mask and nearly gets killed. And the only reason he isn't is bc some bs Dungeon mechanic and the guy not directly finishing him off. Should also mention he was killed (I think? or at least injured. it wasn't explained) by a fish that came from the well/dungeon (when he goes doesn't encounter any such fish as of chapter 12, multiple days after being in the dungeon) and that for some reason activates his system. Yeah, a fish. A mere fish with sharp teeth. I should also mention he was only given the chance to be reborn bc he had a large amount of good Karma. Yet he murders 30 people a year after getting to the new world and tries to murder someone bc he wanted their cool mask. I personally prefer ruthless evil mc over a brain-dead goody to shoes hero stereotype. But not when the entire reason for the plot is happening is because he's supposedly a good person. Another thing is that even after killing so many people, the best weapon he has after all that time is a couple of sharpened rocks. It is mentioned that a butterfly knife (or whatever it was) that he got from a victim mysteriously vanished but the mc doesn't question it at all and it's literally only a single sentence saying jts gone. This would make you draw the conclusion that he can't take others' belongings for some reason, even his they're dead. But he can take one of the victims' masks, and it doesn't disappear?? Overall, nothing is explained, mc is a murder-hobo idiot, and there are a lot of inconsistencies. Don't get fooled by the potential of the story. Was genuinely excited to read this bc it's extremely rare to find a novel where the mc has water/ice powers, and that is one of my favorite elemental powers. And I was met with this.