It's a short story (BL) begins in the past, the era of the Korean kings. It seems that the seme (king), after losing uke, asks a shaman to bind his soul to uke's so he can find him again. In the future, they are both reincarnated and reunited. However, uke has brief memories and is afraid of meeting that king (seme) again.(≧∀≦)
I'm looking for the new manhwa called "Toxin" about a nameless guy with horns who is going to avenge his mother's death when he kills the young emperor Garon