Ryu Jun-yeol is a South Korean actor, activist, and photographer. Ryu began his acting career in independent films, he drew attention from his role in feature film Socialphobia (2015). He rose to international prominence through his breakthrough role in the critically acclaimed television series Reply 1988 (2015–2016) the highest-rated drama in Korean cable television history at the time, which also led to him winning Baeksang Arts Award for Best New Actor – Television. Since then he has starred in the box-office hit films The King (2017), A Taxi Driver (2017), Little Forest (2018), Believer (2018), Money (2019), The Battle: Roar to Victory (2019), and The Night Owl (2022). He also known for his notable work in two parts action blockbuster films Alienoid (2022) and Alienoid: Return to the Future (2024).

Socialphobia is a 2015 South Korean mystery thriller film starring Byun Yo-han, Lee Joo-seung, and Ryu Jun-yeol. It was co-written and directed by Hong Seok-jae in his directorial debut, based on a real-life story that explores the social issues within internet culture among the Korean youth of the 21st century.