To prevent a Korean war, a former agent from North Korea's intelligence bureau Eom Chul-Woo (Jung Woo-Sung) and a South Korean government official Kwak Chul-Woo (Kwak Do-Won) carry out a secret operation.
- Based on the webcomic "Steel Rain" by Yang Woo-Suk (writer) & Je Pi Ga Roo (illustrator) (published from April 28, 2011 to September 19, 2016 via cartoon.media.daum.net).
- Filming begins late February, 2017.
- Actress Ko Ah-Sung has been offered the major supporting role, but declined.
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