Su Yun, a suspense novelist, died suddenly in his previous life after staying up all night rushing to meet a writing deadline. By an unexpected twist of fate, he transmigrated into a parallel world, only to find himself immediately caught up in a murder case inside a villa. An Miaoyin, captain of the criminal investigation team, arrested him on the spot as the prime suspect. Facing a desperate situation, Su Yun demonstrated astonishing micro-expression analysis and logical deduction skills. Using a seemingly insignificant detail—a pair of men's slippers that were far too clean—he not only cleared himself of suspicion but also exposed the carefully fabricated image of a devoted husband portrayed by the victim's husband, Ning Jiansong, and uncovered the flaw in his supposedly perfect alibi. However, as the investigation continued, Su Yun discovered that someone else was the real killer.