Where is the save file location?

[βίος]

I can't find it

[Sheep O'lata]

You can export and import save files from the game menu (never tried the import, but the export seems good as potential backup)
If you export, do whatever you want, and import, wouldn't that work ?

[Slayn]

I would like to know this 2

[PeacePing]

Here it is:
C:\Users\%yourusername%\AppData\LocalLow\guigugame\guigubahuang\Steam\CacheData
This folder contains your active save.