Citizen 21
Cha Eun-woo
Himself
Border soldier
MC
Jeon Tae-ryong
Ah-reum
Lee Su-ho
Angel Raviel
(Episodes 116-177)
Self
Kwon Seon-yul
Cha Eun-Woo
Cha Eun Woo
MJ
Do Gyeong-seok
Soo-hyun
himself
Woo Yeon-Woo
Jin Seo-won
Kang Chan-hyuk / Johan
Raffaello Kidrey
Prince Yi Rim / Maehwa / Prince Dowon
Host
Lee Woon-jung