American Julia Mullock...
is the wife of the recently departyed Yi Gu, the last crown prince of the Chosun Dynasty: 'Last Princess' Denied Final Meeting With Ex-Husband.

Here is part of her sad story, from [Opinion] "Were You Happy?":

However, she found herself sterile, which was the greatest obstacle to her life in such a country as Korea that treats sterile women as sinners. The fact that she was the wife of the prince made such a thing much more difficult. The royal family that saw her in skewed eyes due to her status as foreigner pushed for a divorce, which finally led to their divorce in 1982. After this, the former wife of the eldest grandson of the Emperor of the Joseon Dynasty has struggled with loneliness and poverty without any help.