>>95582247It caught on in korea because their culture is currently engaged in a battle of the sexes between cultlike radical feminists that advocate forced castration and abortion of male babies, and conservative boomers that want a return to traditional gender roles. They perceived interracial as demeaning to women and enjoy it as a form of degradation and humiliation porn. Now it's catching in in other parts of asia just because there's a monumental amount of it pouring out of Korea.
Korea traditionally has pretty strict laws about the production and distribution of pornography but their laws haven't adapted to the digital age so there's been a recent renaissance of korean r18 illustration on places like patreon and fanbox, exploiting loopholes to indulge in the sudden freedom from over a half century of sexual repression.