Monstrum

Kim Myung-min

Yun-gyeom

Kim In-kwon

Seong-han / Mulgoe (voice)

Lee Hye-ri

Myeong-i

Choi Woo-shik

Royal Court Officer Heo

Lee Kyung-young

Sim-un

Park Hee-soon

King Jung-jong

Park Sung-woong

Jin-yong

Lee Do-gyeong

Grandpa Song

Lee Kyu-bok

Mo-gae

Kim Joong-hee

Mak-gae

Kim Kang-il

First Vice-Premier

Cho Won-hee

Second Vice-Premier

Jang Yong-bok

Court Minister

Yun Hui-su

Kang-nyeo

Han So-yeong

Myeong-i's Mom