I, the Protagonist's Gold Finger

Lin Beifan traveled to a fantasy world and was bound to a cheating system. He acted as the protagonist's golden finger to give them cheats, and everything about them would be synchronized with Lin Beifan. So, he transformed into a ring grandfather, a magic sword spirit that assisted the protagonist's growth, a system elf, a martial arts guardian spirit, a mysterious old senior who sold secrets, the ancestor of villains, a ghost of the years, and even the main god... The whole world is his smurf, and he will never return on the road of cheating people! "Protagonists, go and work hard! Those who can't defeat you will eventually make me stronger!"