Beginning with the Human Emperor Banner and Becoming Invincible

Liu Yi traveled to the world of immortality and was kidnapped by the Demon Sect to become a handyman. Awakening the [Human Emperor Flag] system can not only absorb people's souls, but also complete the skills. In order to survive in the dangerous Demon Sect. Liu Yi chose to become a multi-faceted spy, sneaking underground, pretending to be a pig and eating the tiger, and driving the tiger to devour the wolf. From an ignorant apprentice to a master of both law and body. From a rookie who could only carry out sneak attacks to the world-famous leader of the Demon Sect. From a secret undercover agent of the Demon Sect to a leader of the righteous path respected by the world. Many years later. Liu's old friend stood on the mountain and asked in a broken voice: "You, you are the top undercover agent who helps us in the Demon Sect!?" "Yes." "You are the righteous leader of the Demon Sect who dared not leave the house after killing him!?" "Yes." "You tell me now that you are the master of the Demon Sect!?" "Yes." "What is it! What else is your identity that you are hiding from me!?" "I'm still your big brother."