"Little Mermaid" faces backlash in China and South Korea over casting controversy.
Box office disappoints in China, earning only $3.6 million in 10 days.
Social media outcry and negative reviews impact the film's performance.
The Global Times criticizes Disney's inclusion of minorities in classic films.
Hollywood earnings in China have declined, but "Mermaid" flops on a larger scale.
Film performs well in the US, earning over $186 million in 10 days.
International performance remains uncertain, with a disappointing debut.
Japan release and positive audience reception highlighted in marketing efforts.