What happened in history to cause Koreans to dislike the Japanese?

Korea and Japan Friction: It dates back 18th century Pottery War until 20th century Japanese military dictatorship occupation over Korea 36 years. Japan and Korea Friction: It dates back 18th century- 20th century. Koreans killed many Japanese nationalist. Including Ito Hirobumi ( he was bombed by Korean nationalist Ahn Jung Hoon).
Correct fact: Japanese occupied Taiwan over 50 years. Japanese military occupied Korea for 36 years. For Japanese military occupation they had hardest time with Koreans and occupying Korea for 36 years.