How to make a particualr cell to disappear from a spreadsheet and make it to appear again!

Hi guys,

I want to hide 2 particular cells from my spreadsheet (not permanently tho) when other people are around then make it appear again.

What would be the most simplest but effective way to make this work on my excel spreadsheet?

Please find attached the sample file below.

Any help will be greatly appreciated!!

Oh, who said the end of the world is coming this year? why are we sill ALIVEEEEE???

Happy~~~Merry~~~ Christmas everyone and Happy new year!!

Cheers,