The Devil is released into the human world and soon opens a door into a parallel world. The Devil asks if he lived a better life in the other world, if he could live in the other world. Against the Devil's question, Korean Emperor Lee Gon tries to close the door to the parallel world and South Korean Detective Jung Tae Eul tries to protect the lives of people and the person she loves.
|Ratings:||TVMaze: No Rating|
|Released:||April 17, 2020|
|Genres:||Fantasy Romance Drama|
|AKA:||The King, The King: Forever Sovereign, The King: Forever the Monarch, The King: Monarch of Eternity, The King: Permanent Monarch|
|Cast:||Lee Min Ho Kim Go Eun Woo Do Hwan Kim Kyung Nam Jung Eun Chae|