Ahn Yong-joon

The representative of Sungkyunkwan scholars

Heo Jin-ho

Kim Hee-joon, perpetrator

Kim Deok-kyu

Jin Il-do

Yi Geo, who ascended to the throne at a young age as the result of a coup to dethrone his half-brother the king. He once feigned utter indifference in politics as a mode of self-preservation, and even after becoming king he isn't quite able to command full authority and continues the pretending game: he has three facades he hides behind—weak, lax, and indecisive. In actuality, though, Yi Geo harbors "a grand vision for a new Joseon."

Jung Ji-ho (guest, ep 12–13)

Jung Ha-yoon

(안용준) as Kim Beom-woo (김범우)

Teenage Bong-joo

Kang In-ho

Choi Soo-hyuk, Soo-jung's younger brother

Yuri Jung Yoon-seok as young Yuri

Lee Gi-yeong