I'm betting that it's the cliché "the ml is an asshole but slowly fall in love with the fl so now he's possessive and overprotective of his lohl" kind of trope
The ml is only seventeen and is already a king so ╮( ̄▽ ̄)╭ give him time to have some character development. The fl tho... She's already 28, and yet acts like 15
"I Worked Myself to Death and Reincarnated as the Queen of His Majesty, Who a Major Asshole!" bc i dont see any redeeming quality of this kid smh