The book, authored by a former Japanese diplomat, reportedly details the history of Japan's aggression of Korea, telling how "ear tomb" was raised in Japan during Japan's invasion of Korea from 1592 to 1598.

The diplomat said at a press interview that he wrote the book to help the Japanese have a correct understanding of history as they are almost ignorant of the massacres of Koreans committed by Japan in the past and such history is not taught in schools, urging the authorities to make a sincere apology for all the crimes committed by Japan during its military occupation of Korea, though belatedly.

Mass killings of Koreans perpetrated by Japan during the Imjin war which broke out in 1592 were heinous state-backed crimes unprecedented in history.

There is an old grave called "Mimitsuka" or "ear tomb" in Kyoto City, Japan.

During the Imjin war bosses of samurais ordered soldiers each to kill three Koreans each and bring their noses to them. Military exploits were appreciated according to the number of noses.

The samurai aggressors brought the noses of 185 738 Koreans to Kyoto and held a big ceremony of burying them in grave.

The grave was called "nose tomb" at that time.

Later, the aggressors renamed it "ear tomb" as "nose tomb" sounded so brutal.