Oh Young Soo is a very reserved person in his personal life. He has not disclosed any information about his marriage or who he might be in a relationship with.
Some of his fans believe he is a married man but has kept details about his wife away from the media.
In 2021, he portrayed Oh Il-nam in the Netflix survival drama, Squid Game, which gave rise to his worldwide popularity and won him a Golden Globe Award for Best Supporting Actor in a Series, Miniseries or Television Film, as well as a nomination for the Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series.
On November 25, 2022, prosecutors in Suwon announced that O had been indicted on Sexual misconduct charges relating to an incident in 2017.