What does Cn mean??

dropped 

Again a very very new novel

Synopsis:

I had transmigrated into my favorite game, as an extra who died before the story even began.

In a world where Sigils dictate power, I found myself in the body of a boy who had already died on the battlefield.

Yet, as I drew breath in his place, his Sigil changed. A power never meant for him, never meant for me.

Kidnapped by a shadow organization that didn't exist in the game, I spent three years in the dark, forced to learn under a so-called teacher.

I move forward, not as the extra I was meant to be, but as one who chooses their own path. A path to supremacy.

Yet the deeper I walk, the more I realize… this world holds secrets that game had never shown