Park and her mother had difficulty adjusting to their new lives in South Korea, but they managed to find jobs as shop assistants and waitresses. Park also continued her education in Dongguk University in Seoul. In April 2014, South Korean intelligence informed Park that her sister, Eunmi, had escaped to South Korea via China and Thailand. Park and her mother eventually reunited with Eunmi.
Park moved to New York City in 2014 to complete her memoir while expanding her role as an activist. She attended classes at Barnard College and then applied and was accepted to the Columbia University School of General Studies, starting there in the Fall 2016 semester. As of November 2016, she was majoring in economics.
Park has also become a member of LiNK (Liberty in North Korea), a nonprofit organization that rescues North Korean refugees hiding in China and resettles them in South Korea and the United States. On June 12–15, 2014, Park attended LiNK’s summit at Pepperdine University in Malibu, California. Park and North Korean activists Joo Yang and Seongmin Lee worked in sessions and labs, informing participants of conditions in North Korea and of how LiNK can support refugees from North Korea. Park took part in LiNK’s campaign, the Jangmadang (장마당).
Park has also been outspoken about tourism in North Korea, as visitors are encouraged to bow to statues of Kim Jong Il and Kim Il Sung, which she sees as "[aiding] the regime’s propaganda by allowing themselves to be portrayed as if they too love and obey the leader." She was selected as one of the BBC 100 Women in 2014 and is a member of the Helena Group.