Faced with a series of complicated and suspenseful cases, how will the trio of senior chemist Yu Xingbai (played by Bosco Wong), senior inspector Jing Haoran (played by Benjamin Yuen) of the serious crime unit, and senior doctor Fan Peiqing (played by Cai Jie) unravel the mystery step by step, and use science to reveal the facts and find the truth in the midst of dangers? When facing life and death, how will they stick to their original intentions and complete the redemption of themselves and others? All the answers will be revealed in this season's series.