Nooooo, Noh! I have not read the novel so I don't know how things turn out, but I hope for the best. (Like the grandma beating some sense into him or something).
Yeah I kinda understand MC's mindset. His whole life he has desired Ki, like even some plebs can use Ki, but he alone was forbidden from it. Then the complex that he was beaten down by some Murim big shot who uses Ki too. He might've become understanding if everyone just explain everything instead of being some cryptic shits.
Do none of his old mercanery friends have ki, or do they have ki and Noh just never noticed? They kind of implied they were basically already a part of murim but Noh never noticed. He just never ran into anyone that could compete with just his physical strength until the master guy.