Huang Xiaochuan and Shen Xuexin, the "two stars of investigation", encounter a murder case on a rainy night during the graduation season. A penniless college student and a wealthy daughter work together to solve a hotel murder case, but unexpectedly lead to a series of unsolved cases. When a private clinic opened with a special model of "psychological profiling + forensic examination", the seemingly ordinary commission actually hid the truth of an old case fifteen years ago. The lip prints between the two in the coffee cup, the skin flakes between the deceased's fingernails, and the ten seconds missing from the surveillance video, every detail becomes fatal evidence to overturn the perjury. As the shadow of the mysterious organization gradually shrouded, they discovered that all the cases pointed to a carefully woven revenge trap...
