North Korea
Japan tried to suppress Korean traditions and culture and ran the economy primarily for its own benefit. Korean resistance groups known as Dongnipgun (Liberation Army) operated along the Sino-Korean border, fighting guerrilla warfare against Japanese forces. Some of them took part in allied action in China and parts of South East Asia. One of the guerrilla leaders was the communist Kim Il-sung, who later became the first leader of North Korea.
Sunshine Policy
Out of many reasons why the third 2018 inter-Korean summit is viewed to be a huge success is because Moon Jae-in became the first South Korean leader to give a public address and visit Mount Paekdu in North Korea. With such freedom of speech given to Moon, international media thought of this as positive effects between South-North Korean relations, easing military tensions, promoting peace talks and the progressing denuclearization process.