Roh made his debut in 2020 with his appearance in the short film
Driving School (). In November 2023, Roh acted the part of a patient with
delusional disorder named Kim Seo-wan in the series
Daily Dose of Sunshine. Roh realistically portrayed the difficulty navigating the blurred boundaries between reality and dreams and was praised for his in-depth emotional expression. In December 2024, Roh starred as Nam-gyu with a contestant number 124 in the
second season of the series
Squid Game and received recognition both domestically and internationally for his performance in the series. In June 2025, Roh also appeared in the
third season of the series. ==Filmography==