If you may know, Korea for too long a had been a society and government entrenched in Neo-Confucianism, and was servile to China while being hostile to other nations. Make a scenario where the Koreans start to believe that they are the true upholders of Confucianism and stop having the Sino-centric attitude they had for many centuries. The POD would preferably be in the 1700s.
This will help:
Neo-Confucianism in Korea
Korean Sinocentrism
Mandate of Heaven
This will help:
Neo-Confucianism in Korea
Korean Sinocentrism
Mandate of Heaven
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