You do not need to pay to make an account.
And there are many ways to earn some ZYM's !
But for long term use and to have some advantages, you'll maybe need to buy more. As a premium account.
what are the advantages if someone has an Enzym account? will I meet people in the world to talk
It's the purpose of the App.
Actually, we're still in early stage but like every other social App, we need a first wave of people to populate the App.
The advantage is that it is possible to earn ZYM's for the first wave.
If you install the App, make an account and tells some friends to do the same; you'll have the possibility to start the App and "meet them" in the game. This will allow you to earn 70 ZYM's.