Why the title is 19days?

I think it has something to do with either the author(s) or the band but idk either

It was kind off a colab between lots of auhtors
Like an event by some company
A project called nineteen days, were nineteen authors did a day on teenagers romance or something like that

Old xian continued nineteen days after that onehsot, that's why the story has one day like in the name of the project chapters


I think this author had this really great vision after doing the 'nineteen days project'. And that's how it happened, ya so from what was suppose to be a one shot she made this whole thing which is awesome

So basically it was like nineteen chapter, nineteen authors, nineteen days kinda project

This was how it strated
However I'm sure the auhtr has a reason for keeping the name 19 dyas and not changing it