In the world of Xian, achieving immortality is the ultimate aspiration for cultivators. Yet, deep beneath the surface lies a forbidden energy known as Mo Dao, or the demonic path. Cultivator Wei Wuxian experimented with this dark power during his studies and ascended to great heights. However, his success was quickly followed by pandemonium and devastation. Ultimately, the cultivation clans overpowered him, and even his closest comrade betrayed him, leading to his downfall. Thirteen years later, Wei Wuxian is reborn as a madman and reconnects with his old classmate, Lan Wangji. Together, they embark on a mission to investigate supernatural mysteries that threaten the clans' equilibrium. Facing off against demons, spirits, and other cultivators, the unlikely pair develops an unexpected bond. Mo Dao Zu Shi chronicles their odyssey as they traverse the spiritual realm together.