Cultivation: Become an Internal Agent of the Demon Sect at the Beginning

Shen Yuechuan woke up and traveled through time. By chance, he possessed the soul-killing demon cultivator. Fortunately, he had the secret ritual of the Immortal Seal with him, which allowed him to gain the trust of the Immortal Fairy He Qingyuan and avoid the disaster of death. However, he was also planted with a forbidden curse and worked as an internal agent in the Demon Sect. He practiced both demonic skills and immortality, and he pursued the path between immortality and demon... With the curse of self-restraint on him, the lifelong entanglement between Shen Yuechuan and He Qingyuan begins...