I Woke Up Married to the Cursed King

“Can I ask you something?” Arjun whispered. The king looked up. “Do you actually want to die?” Silence filled the room. Then Caelian smiled. Not warmly. Not cruelly. Just tired. After dying in Seoul, Arjun wakes in another world inside the body of a illegitimate son of a count married to a cursed king feared by the entire kingdom. Ghosts follow Caelian everywhere. Something ancient whispers to him in the dark. And every day, the curse around his neck tightens a little more. Arjun should stay uninvolved. Instead, he starts sleeping beside the king at night just to make sure he wakes up in the morning. — Description from novelcodex.org