Shen Yichu joins the Criminal Investigation Detachment of the Beijiang Branch as a mock portraitist and is paired with Captain Du Cheng to work on a case. Du Cheng’s initial provocations hint at a complicated past between them. As the story unfolds, their close cooperation intensifies the tension, bringing their conflict to a peak. The fast-paced plot, rapid portrait sketches, and puzzling clues gradually reveal hidden truths and untold stories.