There is back story of her... From below comments →she was love interest of ML grand father. She promised ml grand father never come back again in their state
I read your arguments/perspective (appreciate how you're putting it out there); please excuse the brevity of this…
No matter what she is victims or blah blah. But she is not good human. She even contract with northern qin(enemy state) if emperors knows that is she ever able to marry Han Ye?
that fake on acted today like she was a victim all along... she got shelter, food, luxury and a good life back…
Di Ziyuan never threatened her, she used her for good, not wrong. I was very upset when she pushed Di Ziyuan. She also misbehaved with her body guard who guard her for 10 years.She contract with Northern Qin( enemy side of their state) This girl continuously humiliated Di Ziyuan family still Di Ziyuan didn’t said anything to her.
I wish i can slap Di Cheng'en. She was orphan girl who has nothing eat or shelter. She got place because of Di Ziyuan and also received many gifts from Prince because she stayed that mountain. How she expected to be crown princess! Even though she didn’t got freedom but it’s better than dying in hunger and without shelter. She has personal bodyguard. What she is expecting more when she lived as a criminal daughter. Such a greedy girl
News 
This girl continuously humiliated Di Ziyuan family still Di Ziyuan didn’t said anything to her.
It’s 39 episodes and no parts. It will be finished in 1 part
https://fb.watch/m2a2UHZRlE/?mibextid=ZbWKwL