No way that is the end. Explain a bit more!! Like what he was talking with grandmother i never believed he would use mc as a sacrifice I think he's taking all the misfortune himself but I still need an explanation. Also the mom looked like a nice lady what was her deal how much did she know? What was that last mission about? The news at the end didn't mention mc at all so was he not really officially adopted by them?
If you are concerned about the skin tone change don't drop it. I was disappointment too but.... don't worry. A little bit spoiler....
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Dark skin tone one is the original body. White on is a fake noble persona. He will change back.