Finding a bl manhwa

Its like a hystorical manhwa. The seme is like a tyrant emperor and the uke is very pretty and is from a clan with horns. The uke was bullied in the clan. The seme was obsessed with the uke and i think the horns or the kiss of the uke is toxis or something (i cant really rmb) I REALLY WANNA FIND THISS.. pls helpp thankuuuuu!!!