We literally have a "hero of the beginning" running around with no explanation on how he trains and combines different fictional energy, and THAT is what you question¿ What are you, 13 years old?
I don't get why Manhwa's always have to make MC's aura farm, like why is he being a d1ck? The other guy seemed reasonable enough. And lile the other guy said, it's not cheating, so if its a matter of survival, who cares? (not saying he should accept it, but at least don't be a douche to someone...
The dad could've been better but calling him "shit" is telling me you're probably 10 years old. Without plot armour MC 100% would've already been dead. I'd say it's a pretty logical decision to stop your son from throwing his life away because he wanted to be like you (with 0 ability to back it...