I think we’re, maybe, being too quick to judge the whole manhwa based only on the first ...

As much as I wish to agree with you on the ‘quick to judge’, unfortunately over here its not the case. This is a very predictable story and not in the sense of storytelling but in the sense of representation. Its the same “mc is different because he freed those slaves” and the problem lies in the “he freed those slaves”, he freed them but where are they to go now? If this had a proper representation and research then it would have shown how freed slaves are not freed because one way or another without any support they are to be slaved again (reminder, slavery took every rights and one of them was education).. And before im hit with the ‘its just fiction it can have flaws’, it is not fiction if it includes a huge part of the worlds history and crisis, these topics should be handled with care and research you cant toss them in and around and expect it to be ‘part of fiction’. Also the author barely even tried with that “freeing slave” scene, its just like throwing money on someones face and then leaving; it’s disrespectful.

He is an indigenous. Indigenous American people were enslaved during the civil war by white supremacists btw. You got a biracial indigenous mc who call himself the white man "humble slave". And the fact you're bringing up "the mc free the slave from their condition" like does that tell you that it's giving white savoir? Like wow thank you white man whose family enslave us for freeing us now. Hundred of people were misplaced after the civil war too. It didn't not give what it needs to give. All it gave was "let me get this over with."

“Mc freed the slaves” that is where the MOST LIKELY white savior plot line will star developing even still this whole thing could’ve been avoided if the author simply just went a different route leaving slavery out of it. What’s the ml being indigenous gotta do wit anything?

THIS. THIS EXACTLY.