It’s fairly complicated but the super simplified version is the publishers do it to avoid problems with the government.
This google doc has more insight if you’re interested
As far as what acts Su You specifically has to perform, it is left fairly vague but certain things are implied based on the fact that it is not so vague in regards to the other girls.
I assume you mean Manhua (my Japanese is on par with a 3 year old). But I do have a shortlist of series I want to work on, so I don’t mind taking a look at another series. But I won’t be starting anything new until I get more caught up with my current ones