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.
김명민
as Yun-gyeom
김인권
as Seong-han / Mulgoe (voice)
이혜리
as Myeong-i
최우식
as Royal Court Officer Heo
이경영
as Sim-un
박희순
as King Jung-jong
박성웅
as Jin-yong
이도경
as Grandpa Song
Lee Kyu-bok
as Mo-gae
김중희
as Mak-gae
Kim Kang-il
as First Vice-Premier
조원희
as Second Vice-Premier
