In Wucheng, in the past five years, 3-4 white-collar workers between the ages of 25 and 35, working in the Internet, finance and other industries, have disappeared inexplicably every year. There were no signs of abnormality before the disappearance. Mobile phones, bank cards and other items either disappeared or were left in their residences or frequented public places (such as cafes and subway stations). No obvious traces of others were left at the scene. The police once set up a task force to investigate, but due to scattered clues and lack of key evidence, the case has never made a breakthrough, becoming the "top unsolved case" of the Wucheng police.
