AHHH I NEED HELP FINDING TJIS MANHUA

Ok so I read this a while ago, sorry if the details are iffy.

I remember that the main character (a man, as it’s a BL) is the CEO of this company and one day he wakes up in a novel. In the novel, he plays a king of the southern(?) empire. The male lead is this stone cold guy with silver hair and the mc tries to get the ml to marry his sister because that’s what happens in the novel.

The mc tries everything in his power for the flow of events to follow the novel but it doesn’t work (as per usual). And eventually mc and ml end up together.