As Han Chen continued to investigate, he discovered that Bai Jinxi was actually his fiancée Su Mian, whom he had been looking for! The accidental amnesia of the two was related to a case committed by a serial killer organization five years ago. The members of this serial killer organization are all codenamed with letters. They act cunningly and enjoy killing people. When they were banned by the police, they created an explosion, abducted Su Mian, and forged her identity to keep her alive. The cases that the two experienced afterwards were inextricably linked to this alphabetic killer organization. The showdown between justice and evil is imminent! When Han Chen and Su Mian regained their memories little by little and planned to join hands to fight against the alphabetic killer organization, they discovered that the perverted killers of the alphabetic organization had already infiltrated them.