It's an example of patriotism
It was "Andreas Vesalius" who was the sixteenth-century physician who published the first accurate and detailed picture of human anatomy, since he was one of the most advanced and knowledgeable surgeons of his time
Because they were being governed by an unjustly government who used their powers to an abusive extent from over taxations to not caring about what the colonists wanted.
I'm not sure but I'd say because of Japan, Japan more or less did not get involved in many wars as far as I know. I know that Japan had no reason to go against Korea but still did and sided with China/North Korea. Because of that a lot of hate came from that and since then even sometimes now South Koreans are not very fond of Japanese.
Also I hope no one takes offense that's what I know I'm not saying all Koreans hate Japanese just some...
Hope this helps
