Jung Jin-young as Kim Yu-sin

Lee Moon-sik as Thingamajig

Ryu Seung-ryong as Namgun

Hwang Jung-min as Silla King

Yoon Je-moon as Namseng

Sun Woo-sun as Gap-sun

Kim Min-sang as Thingy

Lee Kwang-soo as Mundi

Lee Won-jong as Yeon Gaesomun

Shin Jung-keun as Kim Heum-soon

Kang Ha-neul as Namsan

Lee Dae-yeon as Transfer

Ryoo Seung-wan as Commando 1

Jeong Seok-yong as Abai

Yun Yeong-keol as Silla soldier from Suncheon

Park Yong-woo as Goguryeo soldier carrying weapons

Lee Sang-hun as Soldier

Kim Min-seung as Goguryeo, merchant