Ji Chen drove all night to make a living, picking up all kinds of passengers every night. Recently, a strange perfume smell always appeared in his car, and the car recorder often recorded the sound of unanswered phone calls. Until one day, he found a bloody taxi invoice in the back seat. The date written on it was a year ago - the day when the radio host Lan Qian disappeared.
Ji Chen began to monitor the late-night radio program hosted by Lan Qian during his lifetime, trying to find clues. He was surprised to find that Lan Qian's program was full of various help signals, and the frequencies of these signals completely coincided with the "ghost orders" he had recently received.
Ji Chen realized that someone was using online ride-hailing platforms and radio broadcasts to build a huge "mobile killing game." Ji Chen himself has been judged by the system as the "last passenger". If he does not solve the puzzle, he will disappear forever on the next trip.
