Fantasy: I Counterattack the Emperor of Heaven from a Secondary Role

After traveling through the fantasy world and getting a system that was just a walk-on, Li Yan said he was a little confused. What is the use of this system? I'm already wearing it, so you're just going to let me play a minor role? This feeling is a bit sour. Not long after, he encountered the arrogant male lead. Tsk, the emperor was reborn, full of luck, bearing a blood feud, and only came for revenge in this life. And it's also a dark type! This male lead is not easy to mess with. We can't count on the system, so let's rely on our own strength. After all, with the strength of the Martial King Realm, he can't even beat a young male lead, right? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.