Xuanhuan: I, Who Have Unlimited Revisions, Will Be Arbitrary for Eternity!

Summary

Gu Yang traveled to the fantasy world and obtained the modification production date system.   Since then, Gu Yang has embarked on the road of unrestricted modification.   [After you modify your cultivation base to billions of years, you will become a breakthrough immortal emperor and reach the realm of eternal Taoist ancestors! 】   [After you modified the exercise method to hundreds of millions of years, you successfully comprehended the Supreme Sword Sutra, and you can reversibly cut time and space and fate. 】   [You modified the bloodline of the pet white fox to hundreds of millions of years ago, and successfully awakened the bloodline of the ancient nine-tailed fox! 】   ...