This is fairly bad. The FL is a pointless transmigrator of lacking intelligence, the ML is generic tough dude and the father doesn't make sense.
Why doesn't the father make sense? Because we are shown he actually cares about his daughter, but he can't show it out of fear the king will do something to her, this is stablished very early on, by both the father and the ML. When the father interacts with anybody who isnt the FL, he actually shows to be caring and worried of his daughter's well being, whenever he interacts with is daughter, he is a cold man.
Which means he isn't emotionally inept. He can communicate his feelings across to anybody but his own daughter, the person he cares for.
Literally everybody but his own daughter knows he cares. Tha maids know, the guards know, the whole city knows because he sent a whole army to protect her on a shopping trip, going by what the ML says, the men he teaches know too. The king, the whole reason he is hiding his love, knows.
He is treated awfully her whole childhood for absolutely no point. Well, the point is for the FL to believe he hates her, so we readers laugh at this awful contrivance of plot.
I'm not even going to delve into the female lead's intelligence or the male lead's lack of respect, generic lone wolf attitude.
I can't actually think of any other korean romance series that goes bad THIS fast. It's probably a record, the plot stops making sense like 4 chapters in.