lifesketcher
Lol I have a suggestion for possible backstory of Japan and China In the past China has been where cultivator is prominent and obviously they weakened over the years and the Japan understand that and when the world was its chaotic stage the WW They invaded Manchuria to take resources and cultivation techniques of China causing China to cause a valid Hatred over Japanese. Leaking the techniques to a wider world having US and other power take the power with Technology and Cultivation it was able to remain strong and with China Rn taking the second biggest superpower as opposed to America number 1 you decide more on world building