Trivia / Sympathy for Mr. Vengeance

• Enforced Method Acting: In the scene where Dong-jin kills Ryu, the filmmakers weren't able to use makeup, so Shin Ha-Kyun and Song Kang-ho actually beat each other up onscreen. They couldn't shoot the poster for the film the next day because Shin's face was still swollen. Song invited Shin for a drink as an apology.