This is a story of struggle and fight for equal rights and freedom of those who have been enslaved/captured. And it requires a lot of work and moral spine to do what is right.
Both are xianxias in which the FL has a hidden powerful identity even she is initially unaware of which puts her at odds with the ML. Both are bittersweet stories.
Both leads have complicated identities which put them at odds with each other, and ML is in possession of something the FL needs that if she takes it will cost him his life. Both dramas have ambiguous endings with the leads within the world of a painting.