Fifteen years ago, an unjust case left a family living in a dark tomb. Fifteen years later, the elder brother, who was burdened with a mission and yet forbearing, and the younger sister, who was carefully protected and quirky, met a distinguished and charming young master on the road to revenge, and a slightly unreliable and funny foodie, the young marquis. They always worked together by coincidence to solve crimes and fight monsters. It was about friendship, love, growth, and warm redemption.