The core of this story is not simply "the heroine takes revenge and seizes power", but a profound discussion about "fulfilment" and "protection":
Xu Fengjiao fulfilled her daughter's ambition and protected her growth.
Zheng Hu fulfilled his lover's ambition and protected the common ideal.
Haitang finally achieved Zheng Wei's freedom and imprisoned himself on the throne of responsibility forever.
They fought in different ways on their respective battlefields, and finally "reached the same destination" on a higher spiritual level.
Purpose: About "fulfilment" and "protection"