Megumi-H:
Novel and screen play are always different. Tolerance level also different. It can be subjective. So far I can tolerate the novel. And I love how it is play out in drama. As audience I feel that I can sympathize more with the characters. Except YBC, they really make her so extreme. Like she turn bad and just remains like that. Pity the actress, not a likeable role.
I only read a very small part of the novel but I can say drama YBC wasn't flesh out enough. I think her scenes got cut off a lot so we only see her bad deeds. She is pitiful because as a daughter of concubine she was treated badly since birth. Her life background is similar with TTJ. We love TTJ because the drama give us a complete details of his life while we only presented with he bad side of YBC.
YBC will have a 3rd life which wasn't in the novel where she tried to compensate XL's incarnation. Let's see how she pays for her mistakes