I was thinking the exact same thing. Guitar dude is in desperate need for some character development but I guess him being insufferable right now would be a good contrast if the story goes in that direction. I'm crossing my fingers and letting this marinate but it could be a letdown, maybe not, we'll see
Also mind dropping the name for that similar manhwa you were talking about?

I feel like we're all judging too soon, a while back I read a manhwa like this i thinks that's what these r called. The first like 20-29 ch everyone was saying the exact same things and sorta thought so too. But that manhwa turned out to be one of the most character in depth beautiful constructed manhwas I ever read it was really good 10/10. And although right now I do agree with most of you commentors I think and I hope this story will become more deep and better written. Well I hope