There are lots of details the manhwa omitted from the novel.
Like <spoiler>
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Remember the opal ring around the emperor’s middle finger? That’s the magical ring that holds MC’s well being. I don’t know why something so important was omitted. They should have had monologues there, not just some fancy ring “shining”
He needed to show he never cared for her despite him extremely thorn inside. Or the emperor will be more problematic.
That’s why max mentioned “leashed” and “weakness” the emperor held against the the duke.
Though, he made 1 mistake during her childhood, IDK why the hinting of it was also not shown here.
Same with Max’s past. He only had the Duke, and that strong duke was not the usual duke whenever he is with his daughter.
He was not a Yandere. Far from it. He just cannot understand the Duke’s obsession of her daughter’s well being, which as you can see, he is now realizing why and understanding too.
Lastly, the “shadow” room scene, the suicide room, there was more to it than that. That was not supposed to end like that.
Hope this clarifies.
https://m.mywuxiaworld.com/book/Father__I_Don_t_Want_to_Get_Married_8/dir.html
Also check for novel updates website. The have until 50; or wattpad...

Ugh, ngl I wanna punch the dad so badly.... I understand that he's naturally cold-blooded , but when she reminisced her dad pulling her to the shadow room I legit felt nervous and my heartbeat fastened... Combined with him saying 'from now on I'm gonna always be next to you' BRUH you had to wait 18 fkn years?? YOU HAD TO FKN WAIT TILL YOU SAW HER FAINT TO REALIZE THAT YOU HAVE A DAUGHTER THAT HAS A MISUNDERSTOOD LACKED AFFECTION FOR 18 YEARS... I just wanna bitch-slap him at least once. THE same goes for Mikhail, just remembering his past behavior of choosing to love the princess and seeing him go all yandere in this life like his toy got stolen just flips that anger switch yk... (╯°Д °)╯╧╧