The first ever South Korean superhero film.
Distributed globally as an original by Netflix on 25 April 2018.
Jung Yu-mi, who plays the antagonist in the film, previously starred in Dernier train pour Busan (2016) which was also directed by Yeon Sang-ho.
Ryu Seung-ryong and Shim Eun-kyung previously starred in Seoul Station (2016), which was also directed by Yeon Sang-ho.
Ran for 10 weeks at the South Korean Box Office.