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The South Korean gender war also comes from that country having a unique history with slavery and sexism.
During the Joseon dynasty Korea had widespread slavery and most of the slaves were women. Women were expected to do most of the physical labor and household work. The household was segregated with the women having their own shittier part of the house. The few European/Americans who visited the hermit kingdom made note of the men literally doing no work and just watching the women do everything. Women were forbidden from writing, had to tolerate multiple wives and could not remarry after being widowed. They had to wear clothing that was more restrictive than the Burqa and marrying off a woman required paying a dowry so most families were also pushed by material conditions to hate their daughters. Men could also divorce their women by just saying "I divorce you" and reasons for divorce could just be that they were annoying. Them being divorced leading to destitution and slavery.
They basically took the Confucian hierarchy system and committed 1000% to it. Women ranked lower so they did everything. Unironically worse than the Taliban on womens rights and the Confederacy on slavery.
You really can't take Korea and use it to make commentary on the rest of East-Asia. That place is always next level and Japan had nothing like this.