Seven Years of Night is a 2018 South Korean action drama film directed by Choo Chang-min, starring Ryu Seung-ryong, Jang Dong-gun, Song Sae-byeok and Go Kyung-pyo. The film is based on Jung Yoo-jung's novel of the same name. It was released on March 28, 2018.

Ryu Seung-ryong is a South Korean actor. Ryu began his acting career in theater, subsequently becoming one of the most versatile supporting actors in Korean film and television. In 2013, he headlined Miracle in Cell No. 7, which became the third highest grossing Korean film of all time, in 2014 he starred in historical film The Admiral: Roaring Currents, which is currently the highest-grossing film of all time in South Korea, and in 2019 he headlined the comedy film Extreme Job, which is currently the 2nd highest-grossing film of all time in South Korea. Ryu is the first Korean to star in four movies that have drawn over 10 million viewers each.