Steven Seagal bet that Clementine would be a huge blockbuster success in the United States, and swore that if it wasn't he'd never do another starring theatrical role again.
The film involves cage fights (now more commonly known as MMA). In real-life, Steven Seagal has been involved in training MMA fighters such as Anderson Silva.
As of 2020, this remains the only South Korean film to feature Steven Seagal.
Steven Seagal's character, Jack Miller, is a world champion fighter. In real-life, Steven Seagal has a sixth-degree black belt in Aikido.