This is Sang-Hyuk Han's debut in an action comedy film.
Han SangHyuk is the youngest member of South Korean kpop group VIXX.
The film took 32 days to shoot.
The Martial Art used in this movie is Krav maga. Which is the indigenous fighting style of Russia.
This is the second collaboration between Director In-chun Oh and Jung-Tae Kim. Their first movie together was Mourning Grave (2014).