MC with inferiority complex are the most useless character at any novel (except from I Have Nothing), why? Because it’s cheap and uncreative plot device to create an innocent type of character, especially forced behavior. For an example, He had every reason to avenge the suffering and unjust ever since he was a kid but despite after gained very powerful ability and he could simply reverse everything they had done to him, he did nothing at all other than being coward or overly forgiving, why? Because he’s kind of course… This is what to be called a forced behavior.
The illogical behavior of these side character. Boy oh boy, in this story all the characters are either super kind or super evil, there’s no in-between or gray character. All of them felt 1 dimensional, you couldn’t care less with any side character because they have no personality at all.
I suspect this story was made by high schoolers because the story was nothing reflect on real life common sense or logic. I understand that fantasy novel shouldn’t have to follow real life logic but at the same time it cannot be devoid any of it.