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The son of an American who has been held by North Korea for about nine months is pleading for those watching the Winter Olympics not to forget about his father's plight.

Tony Kim, also known as Kim Sang Duk, 59, was detained by North Korean authorities at Pyongyang International Airport on April 22, 2017.

Kim was teaching at Pyongyang University of Science and Technology. South Korean news agency Yonhap reported he also engaged in humanitarian work in the North, helping orphanages. In May 2017, Kim was allegedly accused of “committing criminal acts of hostility aimed to overturn [North Korea].”

In a Facebook video, his son, Sol Kim, said the separation has caused "hard days for our family."

“My family and I long to make contact with my dad," he said. "We want to tell him that he’s soon going to be a grandfather. My brother and sister are [each] expecting their first child.”

On "Fox & Friends" Tuesday morning, Sol Kim said he is supporting the Free USA 3 movement, which encourages people to show solidarity with the three Americans detained in North Korea, including his father.

It asks people to use the hashtag #USA3 on social media and those attending the Olympics to hold up three fingers when cheering on American athletes.

"I'm just trying to bring up awareness for all of them," Kim said. "I'm hoping that more and more Americans and [the] U.S. government just won't forget them."

Watch more above.

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