The King: Eternal Monarch (2020) [Deo King: Yeongwonui gunju] is a South Korean fantasy, mystery, romance television series, directed by Baek Sang Hoon and Jung Ji Hyun. The series stars Lee Min-ho, Kim Go-eun and Woo Do-hwan. It is produced by Hwa&Dam Pictures and its parent company Studio Dragon, it premiered on SBS TV on April 17, 2020.
The King: Eternal Monarch is about a modern-day Korean emperor who passes through a mysterious portal and into a parallel world, where he encounters a feisty police detective.
The King: Eternal Monarch begins in 1994 when the Kingdom of Corea encounters severe upheaval. The King (Kwon Yool) is murdered by his brother Lee Lim (Lee Jung-Jin) and the King’s very young son Lee Gon (Jeong Hyun-Jun) is stabbed in the neck, but he survives and becomes king of the Kingdom of Corea.
As an adult, King Lee Gon (Lee Min-ho) attempts to cross the barrier into a parallel universe where the Republic of Korea exists instead of the Kingdom of Corea. After crossing over he meets detective Jung Tae-eul (Kim Go-eun), who he recognizes from the tragic day in his childhood when his father, the king, was killed and he was stabbed. Lee Gon also discovers that his step-uncle, who was the one who assassinated his father, the king, is in hiding in the Republic of Korea and he is assembling armies to go against Lee Gon while traversing back and forth between the two countries in the parallel worlds.