Immortality Begins with Being an Undercover Agent of the Demon Cult

When he opened his eyes, what greeted Li Si was the chaotic world of cultivating immortals with many immortal sects. Both the demon and the righteous are gearing up to seize the secret. And the white jade scroll that accompanied him when he woke up was his biggest trump card. All skill books are turned into proficiency. As long as you work hard, you will gain something! The only problem is... He was an undercover agent of the Demon Cult, and he died suddenly on the spot as soon as his identity was discovered. In this way, he walked on thin ice between the Demon Sect Saint and the Immortal Sister... No, he shuttled between good and evil, accumulating strength bit by bit. Three years after another three years, three years after another three years. Thousands of years later. "Sir, there is no need to close the net. Let's get to know each other again. I am Li Tianzun."