Thousands of years of killing in the fairy world and five years of indifference in the human world make the protagonist struggle between the identity of "strong" and "mortal"; the guilt for relatives and friends in the human world, and the commitment to the teachers in the fairy world, the regrets of the two timelines must be made up for by a redemption;
Hidden "loopholes in the rules": Why does five years on earth equal a thousand years in the fairy world? Is there a bigger black hand behind Shen Che?
