At the start of the new year, college student Chu Lan's ordinary life ended abruptly. With his loved ones dead and a demon possessing him, he was drawn into a thousand-year struggle of fate. He became both the "only key" to end the disaster and the "vessel of evil" that could destroy humanity. Forced by destiny, he joined a secret agency to break the endless cycle of the Spirit Calamity. Ultimatel

At the start of the new year, college student Chu Lan's ordinary life ended abruptly. With his loved ones dead and a demon possessing him, he was drawn into a thousand-year struggle of fate. He became both the "only key" to end the disaster and the "vessel of evil" that could destroy humanity. Forced by destiny, he joined a secret agency to break the endless cycle of the Spirit Calamity. Ultimately, he faced a choice at the end of the battle between good and evil. (Source: Youku)