Armor: How Can the System Be as Powerful as Me?

Duan Muyan beats Oxer every day, but this time it was different from before. He activated a thing called "system" during the battle, saying it could help defeat the enemy. Duan Muyan tried it hesitantly, feeling that this system was not very good and that he could easily defeat Oxer without any help. So, he rejected the system. And this is just the beginning of everything...