In her previous two lives, Song Wei was murdered in her own home, both times because her front door passcode had been leaked. Yet she died without ever discovering who had betrayed her. Reborn one day, she returns to seven days before her murder and unexpectedly discovers that the photos she takes can reveal the inner thoughts of the people in them. To her shock, she learns that the person who leaked her passcode twice and led her to her death was none other than her own biological mother, Fang Guiying! Song Wei immediately changes her door lock passcode and retrieves the home surveillance footage to stop her mother from passing the code to others. Carefully planning every move and setting elaborate traps, she follows the clues to investigate the true culprit behind both of her deaths. In the end, she successfully catches the killer and brings them to justice.