We Were Just Interns, and You Were Dropped Out of School and Became a General?

[Ghost-control style + system + era of terror + supernatural resurrection] Su Bai traveled to 500 years after the resurrection of the supernatural. Everything in this world is closely related to the supernatural. Even whether he can successfully graduate from school depends on whether the strength of the contracted supernatural being reaches the standard. But Su Bai was expelled from school because he was contracted to an F-class supernatural being with the least potential. Alone and helpless, he was very helpless. How to break through the beginning of this hell? And I thought my life was a tragedy, but I awakened the Ghost Emperor upgrade system... Ding! You sang a song to the contract spirit. The contract spirit was in a happy mood and its level was upgraded to D... Ding! Touch the contract spirit. The contract spirit feels refreshed and its level is upgraded to B level! What's wrong with the low level? Can't I level it up myself? A few years later, the fresh graduates were competing for positions during the internship period. Dressed in a military uniform, Su Bai looked majestic and handsome, with his legs crossed and sitting in the position of a general, looking at these interns of the same age as himself with great interest. Those classmates back then were all dumbfounded! "No, brother, we are still interns. You were expelled, how did you become a general?"