Tl;dw - Unlike China and Japan, medieval Korea followed an extreme school of Confucianism that emphasized hierarchy and age over practicality. After WW2, the South Korean dictatorship government used this tradition to cement their own power. The video argues that these have made South Korea an extremely hierarchical, and in particular, sexist, society. A video game's refusal to sexualize a female character for their (mostly male) audience was thus seen as an attack on the system. A female artist at the studio was accused of being a 'radical feminist', and either fired or resigned to appease fans.
Edit: As Denjin pointed out, it should be Ming Dynasty and not Tang Dynasty.
Not the artist who worked on the character model, either. Just a random woman who had written some of the story, and had previously retweeted support of a movement to keep incels from secretly videotaping people in bathrooms and hotels. For this, she wa labeled a radical feminist and fired.
That channel has done an exceptional job toning down my distaste for some Japanese media by explaining the roots for the tropes I despise. Highly recommend.
Wow thanks for sharing this. I had apparently already seen this guy's video about JRPG bosses, but nothing else. I've now gone through and watched both of those two videos as well as a whole bunch more from him. Really great stuff.