| O Yeong-su's great-grandfather was a member of Goeul. |
| He was born in Kaepung County, Gyeonggi, under Japanese Korea's rule. |
| His family relocated to Paju-si, South Korea, after the Korean peninsula's division. |
| Sadly, his father lost his life to communist forces during the Korean War. |
| Following the war, his family resided in underground dwellings for some time. |
| In 1967, he joined the theater group Gwangjang and had his acting debut a year later. |
| Starting his theater career, he adopted the stage name 'O Young-su'. |
| During the late 1970s, he engaged in voice acting for educational broadcasts. |
| Joining the National Theater Company of Korea's Jayu theater group in 1987. |
| Notably, he played 'Oh Il-nam' in the popular Netflix series 'Squid Game' in 2021. |
| Interestingly, O Yeong-su struggles with acrophobia, a fear of heights. |
