Once upon a time in the battlefield

Jung Jin-young

Kim Yu-sin

Park Joong-hoon

Gye-baek

Lee Moon-sik

Thingamajig

Lee Won-jong

Yeon Gaesomun

Kim Byung-chul

Shilla spy

Kim Sun-a

Gyebaek's wife (cameo)

Ryu Seung-su

Kim In Moon

Kim Seung-woo

Mole 1

Woo Hyeon

Owner

Kim Sang-won

Silla Soldier 5 / Cuckoo 1

Shin Hyun-joon

Mole 2

Go Gyu-pil

Baekje Prince 7

Shin Jung-geun

Kim Heum-soon

Na Hae-ryung

Gyebaek's Eldest Daughter

Jung Hae-kyun

cipher officer

Lee Sang-hun

Soldier