Monstrum is available in: Korean [Original] on Netflix Brazil
Ancient Korea, 1506. The tyrannical King Yeonsan-gun of Joseon is overthrown by his half-brother Jung-jong, whose reign begins with a blood bath. Over the years, traitors plot against him, sinking the kingdom into chaos. In 1528, frightened rumors come to royal palace, regarding a mysterious creature, known as Monstrum by the peasants.
In the Joseon era, a loyal subject sets out to protect King Jungjong from a mysterious creature — as well as a political faction seeking to depose him.