If there is a novel can someone tell me who's ml please be northern duke

I read somewhere that’s he’s nottttt I hate authors why do they make us suffer so much whyyy

TT I just can't see the crown prince as ml. Why do authors give all the memories and fun times with second male lead then after all of that the ml comes and yeets the FL away.

Sam here he’s more like a side character than a 2nd ml. It doesn’t make sense that he’s the ml .