Zhou Xiaobao, a funny assassin from the ancient "Shadow Gate", failed in his mission and traveled to "Da Chu City" which combines ancient architecture and modern technology. He accidentally became the errand boy of Su Qian, the mysterious proprietress of "Gui Inn". He uses ancient assassin skills (qinggong, hidden weapons, disguise) combined with modern tricks (complaining, making jokes, using takeout apps) to resolve daily troubles (catching thieves for neighbors, collecting debts for inns, dealing with gang harassment). At the same time, he discovers that Su Qian is looking for the ancient treasure "Shadow Pearl", and the villain Shen Mo (Zhou Xiaobao's former sect) is also chasing them - Shen Mo is jealous of Zhou Xiaobao's talent and wants to seize the Shadow Pearl to rule Dachu City. Zhou Xiaobao gradually fell in love with Su Qian in the funny daily life, uncovered her identity as a "mausoleum keeper" (the descendant of the family who protects the shadow bead), and discovered that she is the "key" to the shadow bead. In the end, the two used a combination of "ancient skills + modern tricks" to defeat Shen Mo, protect Dachu City, and gain love.
