
Someone below spelled out the whole plot already but I will say the MC and later the ML do some really over the top fuck up shit in the name of revenge. Like yes, the heroine was bad but it's arguably as to whether or not she deserves:
SPOILERS (from memory, may be wrong here and there and these are not in order)
-Being raped and impregnated by beast (ML leads her there with his words)
-Her family fall into complete ruin
-Have her sister (who is also a bitch) be driven mad to the point of becoming an addict who will sell herself to any random dude to get drugs (MC casts a spell on a ring that will cause constant pain and hunger and gives it to her)
-Having her other sisters be sold to a circus and raped by beasts too (they become brainwashed into being the beasts wives and hold down the Heroine while she is being raped by the beasts)
-Have her little CHILD brother be sold into sexual slavery and raped, while the side couple (goody two shoes Knight x whore priest) do nothing to help because they're too busy getting it on instead, yes really.
I did like some aspects of novel but I am definitely disgusted by a lot of it. It is a really really guilty pleasure.

The author, I think, just really wants to hammer in that the MC is the villain of the story. But they also want us to root for him in end, so they write the heroine to be really annoying and hateable. Even then though the revenge is just so over the top, it's cartoonish. I do like the chemistry between the MC/ML tho. If you want to read this, you just gotta turn your brain off for everything outside of those parts honestly.

His punishment is basically he feels humiliated for choosing the heroine over the MC's daughter, who is now viewed as beautiful and kind by everyone. People around him view him as a fool and he becomes a puppet ruler while MC and his newly-won over brigade (prince's former allies) pull the strings. Also the prince later marries his cousin anyway and it's a seemingly happy (?) marriage. So yeah...maybe the author does dislike women lol...

MC's daughter was definitely a typical villainess before MC becomes involved. She bullied the heroine and was casted away as a result. To be fair though, her original father was uncaring and used her as a pawn until she became useless. But in the ensuing story, after the MC transmigrates into being her father, her personality does a complete 180. She's written as if she is a completely kind, innocent, and genuine person, but she really was bitch before so it's a bit jarring tbh. With MC's help, her image is rehabilitated into a saint like woman and she ends up falling for and marrying her brother (raised as siblings but later find that they're not blood related), who was actually in love with the Heroine until he saw her true colors. They live a long happy life together.
If they adapt everything that's in the novel.... y'all are in for SOME SHIT lemme tell you.