Transmigrated cannon fodder Qiao Ying runs into the world-destroying evil spirit Cen Yunyu on her ghost marriage night. To save her life, she lies that she is his future wife, and is also forced to forge a life-and-death red thread. The two travel together toward the Qingling Sect, teaming up along the way to solve the lamp-ghost murder case and getting acquainted with a host of righteous cultivators. While Qiao feigns affection to survive, investigates cases, cultivates, and searches for foundation-building spiritual herbs, Cen Yun harbors hidden thoughts of revenge, probing her origin step by step. As the two pull and spar with each other, they become entangled in sect disputes and righteous-versus-evil entanglements.