What's the hatred between Korea and Japan? Why?

Korea was once a colony of Japan. Up to now, many hotels in Korea have left Japanese usage in language and living habits.

Compared with Koreans, Japanese people don't like Koreans very much. Most Japanese think that South Korea only knows what to imitate them, such as the popular elements of variety shows, and that South Koreans are inferior and like nouveau riche (in fact, South Korea is nouveau riche).

However, Koreans have complicated attitudes towards the Japanese. The hypocrisy and arrogance of Koreans are well known. A social survey was conducted in Korea, and the results showed that the nation that Koreans hate most is Japan, but on the contrary, the survey results also showed that the nation that Koreans like most is Japan, which shows how hypocritical Koreans are. While courting the Japanese who have always bought low-priced goods in South Korea, they secretly cursed, while thinking about how to marry a Japanese man, while secretly cursing Japanese porn actresses. What a ridiculous and pathetic frog in the well.

I study in Korea. When Koreans meet the Japanese, they are closer than their ancestors for eight generations, and they always scold the Japanese behind their backs ... This kind of thing must be very common for friends studying in Korea. I once doubted the backbone of Koreans for a long time before I found out that Koreans have no backbone. How can they be a ridiculous nation?