We Were Promised to Be an Undercover Agent from the Demon Sect, Why Did I Turn Against Everything?

Lin Feng traveled through time and became an undercover agent of the Demon Sect. At the beginning, he was stabbed in the back by his own saint, and became an outcast, with his life hanging by a thread! In a desperate situation, the [Counterattack System of Villains in All Worlds] is activated, optimizing skills, discerning weaknesses, and deducing all things! "Since the demon sect is unkind, don't blame me for being unjust!" He turned around and sneaked into Xuantian Sect, the leader of the righteous path. Asking for your thoughts? I take a leisurely stroll! Righteous method? I have a flaw at a glance! Demonic conspiracy? I'll spoil it ahead of time! With the help of the system, he prospered in the righteous way, gained resources, and was even attracted by the cold and beautiful saint as his confidant. However, Su Miaoqing discovered that this new junior brother seemed to be hiding a shocking secret. He can always anticipate the enemy's opportunities. The techniques he practices are unheard of. The way he looks at himself is... Complicated and difficult to understand. Until that day, the Demon Sect's army pressed on the territory, and the right path was in danger. When everyone fell into despair, Lin Feng slowly walked to the front of the formation, faced his former "boss" Taoist White Bones, and smiled contemptuously: "Who told you that I was really here to be an undercover agent?" "Also, who told you that I... Was fighting alone?"