At midnight, Lin Mo drove a taxi through the wet streets. The passenger in the back seat handed over an old-fashioned flip phone: "Master, if someone calls me on this phone, just tell me that I won't go back tonight." Lin Mo took the phone and when he looked up, there was no one in the rearview mirror. The phone screen lit up, and the first text message came from three years ago: "Don't take orders after midnight, especially from women wearing red raincoats."