I Read the Raws and You do not wanna Know. 
Spoiler!
The Prince is a total Psychopath Ughhh he's crazy and imprisons jaeryun. poor jaeryun, he becomes like a puppet with no life in his eyes and he's heartbroken to know that the emperor/prince is a complete different person from the previous life. And there is Cute Yeomhwa song. he rescues jaeryun. Only 48 chapters cuurrently
