The first 70 some odd chapters detail the FLs struggles with finding herself again while dealing with an abusive husband and his abusive mistress. At the conclusion of this plot point, she travels to the capitol and the world expands much further beyond "cheating husband, mu*derous mistress, revenge" trope.

FL is an empress (obviously), and her husband brings in a mistress. She maintains her strength and dignity, though is obviously grieving the relationship she had, but definitely not to the extent as in TSINO. She falls in love with the ML while confiding in him about her marriage and her feelings and what not. Although he's not completely human, he isn't a devil, and she didn't sell her body and soul to him for revenge. He clearly loves her well before she gets divorced. The antagonist is white lotus tr*sh who gets pregnant and succeeds in getting the empress out of the picture. I haven't read much beyond their marriage so I can't make other comparisons here.

FL puts up with her husband bringing in a mistress, losing even more and more of herself in the process, becoming a shell of her precious self. After being trampled by their ab*se, she finally sells her body and soul to a devil (I'm guessing some type of incubus) and (I'm assuming) falls in love with him. He, at this point, (I assume) is not/doesn't realize he's in love with her and simply thinks of all of this as a fun game. He invites chaos in the name of a good time. The female antagonist is basically the only thing that's almost the exact same - white lotus tr*sh gets pregnant and runs the FL out of the picture.