In 2019, Guo Weijie, a rookie at the Binhai State Security Bureau, accidentally comes across an old cold case. His investigation reveals that there is far more to it than meets the eye, and he sets out to uncover the truth. But time and again, someone else gets to the clues before him. Who is this person?
Nineteen years ago, Wu Yu of the Investigation Division caused the injury and death of a criminal suspect and was dismissed from public service. With no backup and no official standing, he relies on sheer stubbornness and determination, traveling far and wide and getting close to all kinds of targets in his search for the real culprit from that case. What will become of him?
