Lin Xia has been imprisoned in a glass cage in the ward since he was a child. The doctor declared that he would not survive to adulthood. On the night of his eighteenth birthday, at the moment of cardiac arrest, he concluded a bloody contract with the mysterious existence "Si" - in exchange for rebirth at an unknown price.
As the new boundary guardian, Lin Xia inherited the magical power and memory accumulated over thousands of years, and also shouldered the destiny of slaying the demons who crossed the boundary. When he discovered that his mother's forehead was wrapped with deadly black energy and his sister's smile contained a strange soul, he was shocked to realize that this "rebirth" had been carefully designed. The cruelest truth is: the car accident that possessed Si Canhun was not an accident at all...
Concept: metaphor and criticism of social reality