The young divine doctor Zhou Fei, disguised as a man, practices medicine in Yangzhou. On the Dragon Boat Festival dragon boat, she accidentally saves a drowning girl, but discovers a maze set up around an absurd old custom. A divorced female proprietor who started her own business suddenly "dies of illness" and is buried overnight, and multiple women go missing mysteriously. Zhou Fei travels together with the handsome Daoist priest Chang Yu and the passionate county magistrate Wei Yingqi, snatching people back from the gates of hell with medical skills, pretending to be a wronged ghost to force villains to reveal their true forms, and following the vine to dig up the villain's den hidden in the city. Before the storm settles, the mysterious sudden death of an ox leads everyone toward a mother who has feigned illness for twenty years and a long-sealed family secret.