I don't get it. 4 childhood friends that were close enough to go all the way to be the 4 heavenly kings. And the others just went "yup he's weak as shit bye bitch" when he's actually fucking OP. WTF?
They better be trolling, like "yeah that hurt lying to him but we must do that so he would go and raise his level, let's watch and support him in secret".
Otherwise, it's just trash. I see this kind of opening "my party severely underestimated my power so they kicked me now I'll be OP in my next adventure and everyone will realise and worship me" is getting trendy but seriously.