In mid-19th Century Korea, the people of Joseon Dynasty embrace the new religion Donghak. After the founder is executed, Choi Si-hyeong becomes Donghak’s second-generation leader and successfully propagates the religion, but in doing so becomes the object of oppression by the royal court.
| Actor | Role |
|---|---|
 Lee Duck-hwaHae-wol | Hae-wol |
 Lee Hye-youngHae-wol's wife | Hae-wol's wife |
| PPark Ji-hunKang-soo | Kang-soo |
 Kim Myung-gonJun Bong-jun | Jun Bong-jun |
 Lee Seok-kuPan-ok | Pan-ok |
 Choi Dong-joonGye-dong | Gye-dong |
| KKim Kil-hoSu-woon | Su-woon |
| KKim Ki-jooLee Pil-je | Lee Pil-je |
| GGi Jeong-suLee Moo-joong | Lee Moo-joong |
 Park WoongJung Seok-hyun | Jung Seok-hyun |
| OOh Young-hwaKim | Kim |
| HHan Young-suShon Byeong-hee | Shon Byeong-hee |
 Lee Ki-youngShon Cheon-min | Shon Cheon-min |
 Song Yong-taeEo Yun-jung | Eo Yun-jung |
 Choi Jong-wonShon Hwa-joong | Shon Hwa-joong |
 Son Ho-gyunKim Gae-nam | Kim Gae-nam |
 Kim Hak-cheolSeo Hyun-soon | Seo Hyun-soon |
 Kim Kyeong-ranPan-ok's Wife | Pan-ok's Wife |
 Kim Ki-beomNot listed | Not listed |