Roh made a debut in the industry in 2020 with his appearance in the short film Driving School (드라이빙 스쿨).

[2] In November 2023, Roh portrayed 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.

[2] In October 2024, Roh starred in the television series Such a Close Traitor (2024) as a police officer in the criminal behavior analysis team alongside actor Han Suk-kyu.

[3] In December 2024, Roh starred as Nam-gyu with a contestant number 124[4] in the second season of the series Squid Game (2024) and received recognition both domestically and internationally for his performance in the series.

[5][6] Later in June, Roh reportedly will appear in the third season of the series.