Ugghh

Help me I can't remember the manhwa
It's a straight romance fantasy manhwa
I can't remember the other details but I do remember the end where
The male lead is so obsessed with the female lead cause of his demon like powers and so he imprisoned the female lead in his castle which is obviously the north
And they held a wedding just the two of them
And the male lead was so possessive and obsessed that he literally wants to be the only person that the girl sees but he eventually hires 3 servants to serve them but they must remain out of sight
I can't remember the title