This is an odd but somehow interesting mini-show. The storyline is very confusing and the subbing is even more confusing.
It seems to be about a woman (FL) who is seduced by a snake (ML) in human form. His aim is to impregnate FL. After he successfully does that, different people/entities show up wanting to either protect FL or use FLs “child” (spirit orb/bead) for some special purpose. To make it even more confusing, 2 of the people that show up have the same face as FL and ML. There is an explanation for all that happens, but I didn’t fully understand it.
Acting wise this is rather good for this short format.
So, if you are fluent in Chinese this will properly be quite interesting to watch.