- Yu Eui-tae
- Â Mil-woo (Pa-so's subordinate) 8 episodes, 2024
- Kim Do-yoon
- Â Song Woo (The closest advisor to the king) 8 episodes, 2024
- Ko Han-min
- Â Pa Ya (White Tigers) 8 episodes, 2024
- Jeon Jong-seo
- Â Queen Woo / ... 6 episodes, 2024
- Kim Mu-yeol
- Â Eul Pa-so [prime minister of Goguryeo] / ... 3 episodes, 2024
- Jeong Yu-mi
- Â Woo Soon [elder sister of Woo Hee] 3 episodes, 2024
- Ji Chang-wook
- Â Go Nam-moo / ... 3 episodes, 2024
- Lee Soo-hyuk
- Â Go Bal-gi [3rd prince] 2 episodes, 2024
- Park Ji-hwan
- Â Moo-gol / ... 2 episodes, 2024
- Harrison Xu
- Â Go Su-Ryu 1 episode, 2024
- Park Bo-kyung
- Â Yeon Bi 1 episode, 2024
- Jo Han-chul
- Â Woo-do 1 episode, 2024
- Park Do-ha
- Â Go Nam-moo (young) 1 episode, 2024
