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The Suwon District Prosecutors Office announced that the Golden Globe winner, 78, was charged without detention on Thursday over accusations that he inappropriately touched a woman in 2017, Yonhap news agency reported.
The woman originally filed the complaint in December but O denied the accusations, according to Yonhap, and police closed the case in April without any charges filed. The prosecution reopened the case at the victim's request.
O told Korean broadcaster JTBC that the only contact he had with his accuser was "holding her hand while guiding the way" and he "only apologized because she said she wouldn't take issue with an apology."
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In January, O made history as the first Korean actor to win at the Golden Globes, taking home best supporting actor in a series, miniseries or television film for his performance as Oh Il-nam in Squid Game, which Netflix has since renewed for season 2.
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He starred in the hit drama series as Player 001, the Squid Game's oldest player who builds a bond with the show's protagonist Seong Gi-hun (Lee Jung-jae). Seong is later revealed to be the game's creator.
Netflix did not immediately respond to PEOPLE's request for comment.
If you or someone you know has been sexually assaulted, please contact the National Sexual Assault Hotline at 1-800-656-HOPE (4673) or go to rainn.org.