Thousands of years ago, because his younger brother Su Wang (Shou) could not bear the pain and sin of killing his brother with his own hands, he cast himself on the ancient forbidden technique - "The River of Forgetfulness in the Red Dust".
This curse not only erased his memory of his brother, but also made him forget his own identity, becoming an "empty shell" with only the instinct to exorcise demons and no past.
He thought he could atone for his sins in this way, but he didn't know that forgetting was the cruelest betrayal to his lover.
Thousands of years later, the forgotten brother Su Yi (Gong) returns with scars all over his body and unsolved mysteries, only to find that his younger brother has not only forgotten him, but is also using the magic they jointly created to help mortals with similar "obsession."
Concept: urban supernatural/pseudo-orthopedics/reunion/deep sadomasochism