All Cast
Lee Byung-hun
Yu-baek / Duk-gi
Jeon Do-yeon
Sul-rang / Wol-so
Kim Go-eun
Hong-yi / Sul-hee
Bae Soo-bin
Poong-chun
Sung Yu-been
Gam-cho
Lee Sung-woo
Yu-baek's bodyguard
Lee Jun-ho
Yull
Lee Kyung-young
Teacher
Kim Tae-woo
Jon-bok
Kim Su-an
Gu-seul
Kim Young-min
King
Guzal Tursunova
Ju-gil
Moon Sung-keun
Lee Eui-myeong
Kim Won-jin
Fighter