every person is worse than we thought
MC is not completely dumb, he become sociopathic because his stat growth (including INT)is artificially skyrocketed due to his dungeon diving, so he become so calculating that he think it's a good way to seal his retirement
the dumbass man who cheated his gf does not know who he is because they keep his name a secret, instead calling him 'Zero' in the report about SSS ranker, and the blacklist that dumbass bitch did to him, while she did do it, is not authorised because to lift the blacklist, they need to have international conference to lift it for some reason
the cheater bf, get the 'we will not fire you but we will make you', cut his salary in half, and move him to Aichi as punishment, he doesn't know that's how they fuck him up, that particular branch is meant for someone who is punished to stay down, without work to do, he stuck to dead end, he finally can't stand the cheating GF and catastrophically argue with her, leads to..........
the cheater gf, she was fired from the job at boutique store because the owner worked with MC before, the only reason the brand owner let her work there is because she's MC's GF, she moved to Aichi with cheating bf, have a massive fight against cheating bf about money, thought she gonna dive a low level dungeon (the one that allow unregistered to get in), get tricked into deeper part of dungeon by rapist, nearly get raped but someone caused a stampede so they left her there, the stampede killed her
dumb bitch who blacklisted MC, also get the 'we will not fire you but you will hope we do', chain her with custodial work for 10 years, halves her salary and a 'promise' to move her to countryside(where I presumed no young adventurer exist also), that fucked her up because she can't sustain herself with the halved salary, meet up with another friend, decide to have a go with adventuring together, ask the gal-ish girl disciple of MC to arrange an apology, MC agreed to meet, accept the apology but not forgive, then the two girl 'ride into the sunset'
btw, they said S-ranker is as important as prime minister, but does not have a lock to prevent someone to easily dismiss the high ranker, not even SSS ranker that 12 only exist in the world which by the stated logic, probably as important as President of European Commission
they allowed the equivalent of local precinct clergymen fired a fucking president of european commission out of their position and bar them from reapply in the European commission
(as I said in the comments in ch.2.1, whoever design this system need to be gassed live on TV because this is fucking sabotage backdoor stuff hacker would use, how tf did no one did it yet)