Son protested for more than a year for the recognition of her father's status as an unrepatriated soldier, and eventually she was able to bury his remains at the national cemetery in 2015.
"I thought that I finally fulfilled my duty as a daughter," she said. "But it breaks my heart when I think of him having had his last breath there."
Son now heads the Korean War POW Family Association, a group that fights for better treatment of roughly 110 families of South Korean soldiers who never came home.
Through a DNA test, Son was able to prove that she was her father's daughter - which was essential for her to file for his unpaid wages from South Korea. Even if they manage to escape to the South, the children of prisoners of war are not officially recognised, and many of the unrepatriated prisoners were considered dead, or discharged during the war, or simply missing.