Set in a parallel universe, 'The King: Eternal Monarch' tells the story of Emperor Lee Gon (Lee Min-ho) who discovers a portal that connects his world, the Kingdom of Corea, to the Republic of Korea. As he explores this new world, he encounters a detective named Jo Yeong (Kim Go-eun) who is investigating a series of murders linked to the mysterious portal.As Gon and Yeong work together, they uncover a complex web of events that threaten the stability of both worlds. They soon realize that the portal is not just a natural phenomenon but a result of someone's
manipulation, and that someone is none other than Tae-eul (Kim Young-min), a man who appears to be Gon's loyal subject but has a
hidden agenda.Gon's motivations are driven by his desire to find his mother, who disappeared under mysterious circumstances, and his need to protect his kingdom from the threats that the portal poses. Meanwhile, Yeong is driven by her desire to solve the murders and uncover the truth about the portal.As the series unfolds, Gon and Yeong's relationship deepens, and they begin to develop feelings for each other. However, their love is put to the test as they navigate the complexities of the portal and the rivalries between the two worlds.Tae-eul's true intentions are slowly revealed, and he is revealed to be a key player in a larger conspiracy that threatens the very existence of both worlds. Gon and Yeong must work together to stop him and prevent a catastrophic war between the two worlds.Throughout the series, Gon's dual identity as the Emperor of the Kingdom of Corea and a detective in the Republic of Korea is expertly woven into the narrative, creating a rich and complex world that explores themes of love, power, and identity. The series features a blend of action, suspense, and romance, with a unique and captivating storyline that keeps viewers engaged until the very end.