In game she looks someone who is from Korea,so that why
No, at least not for everyone. Krys and many more funarts kinda prove that.
She's of mixed heritage, and it shows. She's not your typical Asian. For me, perhaps, as I'm European, her European features are more pronounced. There's something Asian about her, but it's not a prominent feature, and it's even less noticeable in the game's character. In some frames of the game, for me, it is not visible at all, and only in others can it be noticed. However, Asians are probably much more sensitive than I am and will see it completely the other way around. People don't perceive people the same way.
And since the game is a French production with French characters, I don't see why Krys would have to rely on the actress's (which was only a loose inspiration) mother's heritage.