My god! It is so hard to distinguish between them. Atleast changed the hair colour.

Just tell does every single person in Korea has a different hair color ???

But it's not a real world right? It's just a manhwa, and others (authors) has used different colors to differentiate among characters, if they were looking too similar.

Have you not thought that maybe the author wanted to make it realistic?? And why r u comparing them to other authors that's rly no a very smart move to defend ur idea

Excuse me, Realistic? What is realistic here anyway? A middle age man........Well I am not going there but Clearly, I'm not the only one who has raised this issue. And didn't you have any difficulty distinguishing between them? Or is it that you consider all korean/asian to look similar and stereotyping them?

I think youre the one whose stereotyping asians to look the same im literally Chinese lmfao and im victim of this stereotype everyday why would you even bring that up

Well, I'm an Asian too, but from your comments, it gave the impression that you stereotype Korean people.
I just gave my opinion and you gave yours. And I feel like we don't even need to argue with such trivial matter. Let just end it.
Have a nice day :)