That back story was pretty boring. I would have liked it more if the another gave us something built up (like the author didn't have to say anything at all this chapter, just leave it at "I was betrayed too") or with depth or anything not super generic. I'm supposed to believe the MC distrusts humans and lives alone in the forest like a witch because at one point a party (of wanted criminals) he barely knew tricks him, AND he turned them in and got paid later? That back story is just so boring and does little to explain his current personality. Something that happened when he was a kid would make sense for trauma or something huge that happened years ago. "I got tricked by wanted criminals" doesn't do it for me. If anything that's just a lesson to always check the wanted posters