so subtle as to be difficult to guess what comes next
Chinese idiom, Pinyin is sh é NMI à om à C è, which means to describe wonderful to the extreme. From three days of the Yangtze River.
Idiom explanation
Unpredictable: cannot speculate, estimate.
The origin of Idioms
Liu Baiyu's three days of the Yangtze River: "in the gorge, the strong sunlight and milky white clouds interweave. A few steps away, there is sunshine on this side and clouds on that side. It's really mysterious."
so subtle as to be difficult to guess what comes next
there cannot be two kings in a country - tiān wú èr rì
hear readily without comprehending what is heard - ěr shí zhī tán