Joh Keun-shik Director Ryu Seung-beom Jung-pil Actor Im Eun-gyeong Actor Gong Hyo-jin Na-young Actor Kim Gwang-il Sang-mahn Actor Bong Tae-gyu Soo-dong Actor Choi Woo-hyeok Young-mahn Actor Lee Chang-hak Iron Mask Actor Geum Bo-ra Joong-pil's Mom Actor Ahn Kil-kang Taekwondo Master Actor Ryu Seung-soo Judo Chief Actor Park Seong-bin Taekwondo Chief Actor Lee Hae-jun Writer Lee Hae-young Writer Lee Ji-hyeong Writer Jeong Jin-wan Writer Park Mu-seung Producer Lee Sun-gyu Executive Producer