Looking for a manga

It’s a yaoi/shonen ai manga set in ancient china, mc is not the king but some type of official and they were reincarnated or transported to this world. ML is a hostage from an enemy country, and is the future leader of that country. The story starts when they are kids and spends a lot of time on this period of their like, with MC trying to survive and befriend the ML who falls in love with him. ML also has some type of magic powers and a lot of poisonous pets.