Question Is cultivation based novel's magic system Soft magic system or Hard magic system?

hard magic system https://en.wikipedia.org/wiki/I_Ching
other than that is soft.

 

That's not really how it works. Stories don't fall into being soft magic. They are so by virtue of not trying to define anything about how their magic system works. The moment they start doing so they're not soft any more. Bear in mind that there's no need to define everything as define is more in the sense of "this is a rough idea of how it works" and doesn't have to be "this is exactly how it works and these are its parameters".

 

The thing is that soft/hard writing system isn't some simple binary that all stories have to fall into, there can be levels of degree and different kind of combination. The distinction is more just a kind of Fantasy101 advice given to new authors so they start thinking about what kind of story they want to tell and how to tell it consistently, and realize that not everything has to be explained.

But an established author who is aware of these principles can make all kinds of decisions and creative combinations, for example they might start out with a fairly hard magic system, and then have a new character start doing things in a more unexplained "soft magic" way that makes them mysterious, and maybe it makes sense to explain it later or not. Its all about how much info the audience needs at what point, if at all, for what the story is trying to do. There's no reason all stories have to fit into one or the other, the terms are just to help talk about these aspects, rather than some definitive classification system.