The mc is literally older than the hero, he's 35 while the hero is 22, if we're going by age then it's the hero who should respect the mc (tho he doesn't know the MC's real age) and the hero isn't exactly respectful to anyone either, he's casual with everyone. I almost doubted him to be a devil pawn cus he was suspicious at the beginning but it's just his straightforward character....
It's an unwritten phenomenon in isekai. The soul adapts to the body sooner or later. MC slowly starts acting like a true child (cheeky, rude and energetic) because he can get away with it. Because the environment calls for it.
Yow! When you said "I'm in chapter 37", I thought you said you're 37 y/o. I didn't read chapter but read it as your age when I see number 37 damn my brain who though you want to pick a fight with MC.
I’m in ch37.. aren’t the MC getting rude and high up by the day towards adults esp the Hero character. He’s an adult isekai’d and transmigrated to the game world but as the story progresses, he’s acting and thinking like a child which irritates me, sorry just my opinion.