The Player That Can't Level Up

I received the invitation from the Tower at the age of 18. This was an invitation that was only sent to those who were qualified to become a player.
As one of the Chosen Ones, I even obtained a unique ability, yet five years later, I am still at Level 1.

Original Novel:
KakaoPage, Naver Series, Ridi, Snackbook, Onestory, Nate

Official Translations:
English: WuxiaWorld