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 (at the time) the third highest grossing Korean film of all time, and in 2019 he starred in 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.