In the wuxia Chinese dramas it's very common for characters who went through great stress to have white hair. But, apparently, stress and emotional charge isn't the exact reason for this to occur, given that there are other occurrences of this situation and the hair color remains.
The other characters apparently fear those who have white hair.
Some of the dramas that can be cited, in which this phenomenon occurs with one or more characters, are Princess Silver and Ashes of Love, but there are plenty others.
Is there a relationship with Chinese culture or mythology, which explains why, exactly, the person loses hair color, and why it is feared?