The class group of Class 7 of Senior High School, which had disappeared for ten years, suddenly resurrected. The class leader's "nostalgic red envelope" contained a fatal rule - the person with the best luck must complete the strange task within 24 hours, and those who fail or are exposed will suffer "accidental" death. The childhood friend of former investigative reporter Chen Yan died in a car accident because he refused to go to work. The photos of the old teaching building left at the scene brought Lin Xiaoman's "accidental fall case" back into the shadows ten years ago.
