Does anyone know this?

I’m looking for a bl manhwa in which I think mc is a hero and when he returned from victory or sumthing he decides to leave but the emeperor(i think?) trapped/imprisoned him??? I only came across this one time and now it won’t stop bugging me, If anyone knows please do tell! Also I think the mc had black hair? Either that or ml had black hair or probably both of them do sorry I just really can’t remember