Kim Il-sung failed, Park Chung-hee succeeded

Both started economic development in the post-war 1960s.
Park Chung-hee steadily progressed through light industry in the 60s and heavy/chemical industries in the 70s, etc.
Kim Il-sung messed around with various things and ruined everything
(likely influenced by Mao Zedong, who was also making blunders simultaneously)
From the 70s, he talked about fortifying the entire territory and militarizing the entire population,
effectively turning the land and the people into a mere shield.
Park Chung-hee passed away in '79,
and Kim Il-sung committed all sorts of atrocities before falling into hell in 1994.
About 30-50 years later, the present:
South Korea's GDP per capita is $36,227 (World Bank).
For North Korea, statistics are inaccurate, but it is said to be $550 as of 2024.
South Korea has surpassed Japan ($35,985) in this regard.
North Korea's level is similar to countries like Somalia, Sudan, and Burundi (the lowest in the world).