When micro-expression expert Cha Yan handles the divorce mediation of Lin Feng and Chen Xue, he keenly senses that this couple is deliberately concealing the truth. To ferret out the true reasons behind their emotional crisis, Cha Yan braves Lin Feng's furious obstruction and presses on step by step. He not only uncovers the secret of the wife secretly taking antidepressants, but also points clues directly to the study tightly guarded by the husband. In this psychological game full of defense and disguise, the past hidden in the study drawer becomes the greatest suspense. Cha Yan will rely on his professional insight to shatter lies, attempting to save this marriage on the verge of despair.