Actor Ha Young apologized Wednesday over allegations surrounding her great-grandfather's pro-Japanese activities during Japan's 1910-45 colonial rule of Korea, saying she was "sincerely sorry" as his descendant. The actor issued the apology in a handwritten letter posted on her social media account, a day after her agency acknowledged that her great-grandfather Ahn Sang-ho (1872-1927) was a member of an organization that allegedly took part in pro-Japanese activities. "I had only partially known about my great-grandfather's life through stories told by my family," she said. "I am ashamed, that despite my ignorance, I had spoken on many occasions about him as a source of family pride." "I believe the fact that I had not known about it cannot be an excuse for disregarding or lightly considering that history. I take that mistake heavily and as a descendant, I am sincerely sorry," the actor said. While appearing on an episode of the KBS talk show "Problem Child in House" last week, Ha Young mentioned how her great-grandfather studied Western medicine in Japan as she explained that medical pr