Do you feel any apology when you are criticized by a sin which you really didn't do? I will not feel any apology at all! Instead, I will feel anger.
Of course, I mention about the story of comfort women's sex slavery. It's a terrible dishonor based on a fiction!
When talking about comfort women, the story written by a Japanese ex-soldier, Seiji Yoshida, is often referred as the evidence for sex slavery. Before he published the book "My war crimes", Korea did not criticize about comfrot women. Korea's claim is often based on the book. However, surprisingly, we know today that the story is a fiction! Seiji Yoshida admitted it on May 29, 1996.
Why the story is still believed by people? It's because Seiji Yoshida's book was really popular amongst left wings in Japan, who were strongly connected to North Korea and China. Asahi news paper, where lots of left wing reporters belong, published an interview with Seiji Yoshida on 1991, then the book was widely known to people in Japan and Korea. The book was often used as a material for extortion against the Japanese government, left wing news papers blamed the government violently, consensus was twisted. The government was forced lots of compromise with Korea due to the fiction story.
Japan is criticized by a fiction for long time. Can you imagine how much anger Japanese people are feeling? No room for apology.