정진영
— Kim Yu-sin
박중훈
— Gye-baek
이문식
— Thingamajig
Lee Won-jong
— Yeon Gaesomun
Kim Byeong-cheol
— Shilla spy
김선아
— Gyebaek's wife (cameo)
류승수
— Kim In Moon
김승우
— Mole 1
Woo Hyun
— Owner
Kim Sang-won
— Silla Soldier 5 / Cuckoo 1
신현준
— Mole 2
Ko Kyu-phil
— Baekje Prince 7
신정근
— Kim Heum-soon
나해령
— Gyebaek's Eldest Daughter
정해균
— Cipher Officer
이상훈
— Soldier
김광식
— Baekje Soldier
양진우
— Gwan-chang