They do like each other. Koreans love Japanese food and many Japanese also like Korean food. They watch TV shows from each other. Many TV shows are often just translated versions from the other country.
It's actually the politicians who want the people to have enmity to each other and some people are vulnerable to the propaganda. The existence of the North Korea regime and their history of kidnapping Japanese people also don't help. Much of their economic strength also overlaps, so there's competition as well.
If you still don't understand, think about close European countries. They probably get along just fine, but Brexit happened..
It's actually the politicians who want the people to have enmity to each other and some people are vulnerable to the propaganda. The existence of the North Korea regime and their history of kidnapping Japanese people also don't help. Much of their economic strength also overlaps, so there's competition as well.
If you still don't understand, think about close European countries. They probably get along just fine, but Brexit happened..