The Evil Spirit Is so Strong That You Call Yourself a Demon Slayer.

Su Ran was originally an ordinary person, but he accidentally traveled through time and possessed a Huang-level demon slayer from the Demon Slayer Guard of the Daqian Dynasty. However, his qualifications were not good and his strength was slowly improving, so he was looked down upon and ostracized by the Demon Slayer Guards. In a desperate situation, Su Ran was forced to practice evil sect techniques, and unexpectedly activated the mysterious demonic system. This system gives him a heaven-defying ability - he can obtain lifespan by killing people, and lifespan can be used to improve his magic skills. From then on, Su Ran embarked on a counterattack path full of controversy and thrills. He relied on the magic system to overcome obstacles among the demon slayer guards, rose up at an astonishing speed, and carved out a world of his own.