The King: Eternal Monarch — Characters & Cast

Restoring balance to his kingdom, protecting Tae-eul, and eradicating Lee Lim's treason.

Begins as a traumatized, solitary king obsessed with solving mathematical mysteries and finding his savior. Evolves into a selfless ruler willing to reset time and sacrifice his own happiness to defeat Lee Lim and save both worlds.

Upholding justice and keeping her loved ones safe.

Tae-eul starts as a pragmatic, cynical violent crimes detective who doubts Lee Gon's claims. Over time, she embraces the reality of parallel worlds, fighting alongside Lee Gon and risking her life. Luna starts as a terminally ill, hardened criminal in Corea, but ultimately chooses redemption over stealing Tae-eul’s life.

Unconditional loyalty to Lee Gon (Yeong) and protecting his family (Eun-seob).

Jo Yeong moves from a stern, emotionless royal guard captain to a deeply caring friend who takes a bullet for Lee Gon. Eun-seob grows from a goofy civil servant into a courageous protector when forced to impersonate Yeong in Corea.

Achieving immortality and ultimate reign over all dimensions.

Remains pure evil throughout, growing more arrogant as he builds a secret army of doppelgängers across worlds.

Uncovering his true identity and unrequited love for Tae-eul.

Discovers he was stolen from Corea as a child by Lee Lim and placed in Korea to replace a comatose boy. Struggles with identity crisis before choosing to aid Lee Gon in stopping Lee Lim.