Lin Zhou, a 20-year-old delivery rider, received a delayed text message from his girlfriend Qin Yong on her mobile phone after she committed suicide by falling off a building. Following a series of "package tasks" and cold clues, he uncovered a "grey box project" that controlled the network under the guise of a "psychological mutual aid organization." The truth emerged - his unintentional change of appointment brought her into the space-time gap of death. In order to protect the still living victim, he chose to bear the heaviest layer of guilt in the trial.
