Detective Lin Shen has a secret: he never relies on evidence to solve a case, but relies on the murderer's "emotion" left at the scene.
Portrait artist Gu Yu'an also has a secret: what she draws is not the suspect's face, but their psychological map.
A case involving the disappearance of a university professor forces two people who never trust others to join forces.
They thought they were getting to the truth.
Little did they know that the murderer was also painting their portraits.
And behind the canvas, there is an answer that neither of them can face.
