[This is not 1v1, nor 1vN. It is difficult to define feelings. The perspective is changeable and not fixed.
Xi Qianwen is a bad guy through and through, and Lou Zhiyi is an extremely serious love-head who would even resort to self-mutilation in order to gain Xi Qianwen's attention.
[Cruel, selfish female protagonist × Extremely love-minded, self-harming male protagonist]
Linwang Xiwen is the only king with a different surname in Cenxia Kingdom. Xiwen is ruthless and selfish. For her, men are just a transaction of interests, and children are the family's power to balance the family's power behind the servants in the backyard. Once her interests are touched, Xi Qianwen will deal with those people without hesitation. Love is just a stumbling block for him. If someone hurts her, she will be repaid tenfold in time.
Lou Zhiyi was originally the most inconspicuous among the many servants of Xi Wenwen. Later, due to a pregnancy and childbirth after sleeping with him, Xi Wenwen had an image, not because of the child, but because Xi Wenwen realized that Lou Zhiyi and she were equally crazy, one was destructive and the other was self-destructive.
From then on, Lou Zhiyi began the "road of being favored", and Lou Zhiyi, who was just a little servant, was promoted to the side king, and finally the main king. What Xi Qianwen liked was that Lou Zhiyi was similar to her, but if Lou Zhiyi disobeyed her and did something detrimental to her interests, then Lou Zhiyi would not have to live.
Note: Both are crazy, both are sick! Don't argue with the patient!