The videos came to light after Hwang’s sister-in-law shared them on social media last June, in an attempt to blackmail him.
She was sentenced to three years in prison in September for the blackmail after Hwang sued her.
However, the charges against him proceeded as prosecutors said he filmed the videos illegally.
Prosecutors refused to provide details on the women in the videos to prevent further harm.
“I will not do anything wrong in the future and will do my best as a footballer,” Hwang told the court in Seoul.
“I sincerely apologise to the victims who have been affected by my actions, and I am deeply sorry for the disappointment I have caused to all those who have cared and supported me,” he added.
