hi! there's always room for more input, but FYI, there have been similar questions, so check these out

on Chinese castles

Why didn't Asians build castles like the Europeans?

Why did castles only appear in Europe?

How accurate is Dan Carlin in saying that medieval Chinese fortifications were the most advanced of the time?

on other Chinese fortifications, i.e. the Great Wall

Did the Great Wall actually provide any tactical benefit to China? How did affect the political/military/economic landscape of the time?

Did the Great Wall pose any sort of challenge to Genghis Khan's invasion force?

Was China's Great Wall militarily effective, and if so, for how long?

and (just cuz these are interesting), on Japanese castles

Why are Japanese castles built of wood as opposed to stone?

What military value did Japanese castles have, compared to European castles?

How did the Japanese lay siege to their castles?

Why didn't Europe adopt Japanese castles?