Responses
Um I don't know how much you know about Wuxia and Xanxia, which are the most common genres in Chinese soap operas, but that's very common. It is a technique used to perfectly change the appearance, this occurs in many stories. Do not forget that at the beginning of this story the other took the place of the heroine using the same technique. But hair change usually only occurs on the sleeves, as the stories preserve the main features of china, white skin, black hair and black eyes. Hope this helps.
I'm kind of confused. Is the white haired guy "lord hell" the Uncle from the earlier chapters? How did his hair turn white? Actually more like how did his appearance change so much?