There is a flurry of activity in the world (especially in the IT field) regarding the "face recognition system".

Well, I won't mention this because it's easy to find out if you Google these keywords.

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By the way, "Cinderella" uses "foot size" to authenticate her identity.

It's a very roundabout way of searching. The prince should be able to identify himself in person.

Well, the "foot size" is the primary check and the final check is probably an interview by the Prince himself.

If that's the case, I'm guessing that multiple search teams at the palace are dividing up and inspecting all of the city's daughters.

The search team would have to create at least several pairs of imitation Cinderella shoes, which would be quite a lot of time and effort, I think.

In an age when there were no 3D printers, with wasting the people's tax dollars.

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In order to facilitate these investigations without public outcry

"A designated infectious disease has been detected in these glass shoes. We need to isolate the infected as soon as possible"

I think you'll need to make up a story like this.

So, if

"All ball attendees will be called back to the royal palace to be subjected to PCR testing as concentrated infectious contacts of the source of the cluster."

With including prejudice and discrimination against infected people and health care workers and the social problems caused by such ignorant people, I would like to see a stage,

"Cinderella 2020"

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It's not just a criticism of people who don't think scientifically or who are lazy enough to try to acquire the right knowledge on their own. I think it's time to start examining the "conspiracy of power" that exploits the "infection".

In fact, this kind of (misuse of infection and quarantine) power conspiracy is ragged if you look into modern history (especially during the world wars).