I have seen a bit of it in China, although to me it looked a bit like soap operas featuring oppressive japanese occupiers. A bit hard to fathom if you only speak english.

It isn't impossible for foreign language media to become popular in English speaking countries. One of the most popular Netflix titles this week, Squid Game, is Korean language with English subtitles.

They're also incredibly dull, poorly acted, bad script and low budget.

They are not dull and budgets are not always small, certainly recently.

Chinese culture is different from American culture and much less "in your face". A lot of the scenarios are much more psychological with layers of deception, double to triple agents, betrayal, quiet sacrifice, etc.