The 78-year-old actor is accused of inappropriately touching the body of a woman in mid-2017.
The alleged victim initially filed the complaint against Oh in December 2021.
Authorities closed the case in April but reopened it again at the victim’s request.
Prosecutors in Suwon (near Seoul) revealed they charged Oh Yeong-su on Thursday (November 24).
Oh has denied the allegations.
In a statement shared with Korean broadcaster JTBC, the actor said: “I just held her hand to guide the way around the lake. I apologized because [the person] said she wouldn’t make a fuss about it but it doesn’t mean that I admit the charges.”
The AFP news agency quoted a Suwon court official as saying that “everything reported by local media is not factually correct.”
In Netflix’s hit series, “Squid Game,” 456 desperate contestants compete with each other in a mysterious and deadly survival game involving multiple rounds of childhood games to win 45.6 billion won prize money that can pull them out of their misery.
Oh Yeong-su played “Oh II-nam,” the oldest participant in the survival competition, and appeared to be a kindly foil amid a mass of violent self-interest.
Oh won a Golden Globe Award for Best Supporting Actor in a Series, Miniseries or Television Film.
He also received a Primetime Emmy nomination for Outstanding Supporting Actor in a Drama Series.
Director Hwang Dong-hyuk has confirmed there will be a “Squid Game” Season 2.
Hang said due to the show’s popularity and the pressure from fans for more – he really has no other choice but to make another season.