THE KING: Eternal Monarch episode 9

Set in two parallel worlds, the series follows Emperor Lee Gon og the Kingdon of Corea who discovers access to an alternative reality after crossing a mythical door opened by his half-uncle Lee Lim, where the Republic of Korea exists in the Kingdom's stead and sets out to put an end to Lee Lim's atrocities and retrieve the other half of Manpesikjeok used as a portal between two worls.