C5003

Loong Fei waited quietly, feeling slightly shocked in his heart.

When he heard the system notification, his heart was filled with anticipation.

"Finally, a system that can be used to upgrade the system has appeared. I wonder what kind of changes it will bring to the system!"

Loong Fei thought to himself.

"'Ding... Congratulations player for killing Excellent Boss Gu Ren