When Shen Yi first joined the Criminal Investigation Detachment of the Beijiang Branch as a mock portraitist, his leader arranged to work with the criminal police captain Du Cheng to handle the case.Du Cheng's initial provocations established the history of the feud between the two. As the subsequent plot develops, the two's close cooperation pushes the sense of confrontation between the characters to a climax.The compact plot, flashing portraits, and confusing clues of the case seem to tell the hidden truths and unknown stories.