What to do?

If I use this plugin will it delete my 7 users already registered (I don’t want to press delete data – just want to add 5 and remove them manually later).
My perfect scenario would be as stated above – keep current members, add 5 , test and delete added 5 manually. I don’t want the plugin to mess with my existing users.

So, will it be ok if I just create new users and don’t delete data or does it delete data automatically after using plugin?

https://wordpress.org/plugins/demo-data-creator/