Criminal psychology expert Chen Yao was invited to assist in a murder case on a rainy night. A scarlet umbrella inserted upside down was discovered at the scene. The fragment of page clenched in the female victim's hand turned out to be the first annotation of his unpublished thesis - "The sense of ritual stems from childhood trauma."
Interpol Lin Ye, who was suspended for violating discipline, was forced to become Chen Yao's temporary partner. The genius in a wheelchair is rational and sharp-tongued, while the retired police star is impulsive and brave. They both have secrets: Chen Yao is pursuing an old case of disability, and Lin Ye is looking for clues to his brother's unjust case. Suspicions are about to arise at the crime scene.
