The three realms (heavenly, human, and boundary) keep their balance by cycling souls from one to another, often by force, with the responsibility of transferral falling to the boundary realm’s Black & White Warriors. The youngest of these are Heng Wang and Liang Yan, a unique pair who have never completed an assignment and only seem to excel at being late.
An action-drama with an initially large streak of comic relief which almost entirely disappears by the halfway point.