Mu-jin's driver who shows off his fighting skills against Hye-jin in the final showdown, is played by veteran Korean martial arts director/action actor Won Jin, who fans of Hong Kong martial arts movies will recognise as super-kicker Sonny Wong from Operação Escorpião (1992).
The opening and closing song, My Name, was written and composed by Hwang Sang Jun and ft. Swervy and Jeminn [My Name OST]. Swervy, born Shin Yu-bin, is a popular South Korean rapper. In 2020, Swervy revealed in an Instagram post that she is genderqueer and goes by all pronouns. Hwang Sang Jun, also known as Hwang Sang-Joon, is a Korean film composer. Since 1993 he has composed over 45 movie scores.