Main •
Yang Se-jong as Seo Hwi •
Moon Woo-jin as young Seo Hwi :A warrior who is the son of a famous swordsman who was framed and put to death. •
Woo Do-hwan as Nam Seon-ho •
Kim Kang-hoon as young Nam Seon-ho :An ambitious military officer who is the illegitimate son of a high-ranking official. •
Kim Seol-hyun as Han Hee-jae • Uhm Seo-hyun as young Han Hee-jae :An intelligent and outspoken woman raised by
kisaeng in
Ihwaru. •
Jang Hyuk as
Yi Bang-won •
Ji Eun-sung as young Yi Bang-won :A prince who helps his father overthrow the Goryeo dynasty but is not recognized for his contributions.
Supporting People in the Palace •
Kim Yeong-cheol as
Yi Seong-gye, Yi Bang-won's father •
Ahn Nae-sang as Nam Jeon, Nam Seon-ho's father •
Park Ye-jin as
Queen Sindeok, Yi Seong-gye's second wife • Lee Hyun-kyun as Yi Bang-gan, Yi Bang-won's elder brother • as Yi Bang-seok, Yi Seong-gye and Queen Sindeok's second son • Kim Min-ho as young Yi Bang-seok
People around Seo Hwi •
Yu Oh-seong as Seo Geom, Seo Hwi's father •
Cho Yi-hyun as Seo Yeon, Seo Hwi's sister •
Park So-yi as young Seo Yeon •
Ji Seung-hyun as Park Chi-do, lieutenant who used to work under Seo Geom • Lee Yoo-joon as Jeong Beom, soldier who fought alongside Seo Hwi in the army •
Shim Wan-joon as Ggae-kku •
In Gyo-jin as Park Moon-bok, soldier who worked as a medic in the army
People in Ihwaru •
Jang Young-nam as Seo Seol, owner of Ihwaru •
Hong Ji-yoon as Hwa-wol, kisaeng who worked in Ihwaru •
Kim Dae-gon as Kang-kae • Jang Do-ha as Gyeol, security guard of Ihwaru
Others •
Choi Go as Lee Bang-beon • Kim Seo-kyung as Cheon-ga, Lee Bang-won's subordinate • Kim Jae-young as Tae Ryeong, Lee Bang-won's subordinate • Kim Dong-won as Hwang Sung-rok, an ex-soldier who is working for Nam Seon-ho ==Original soundtrack==