In a bustling city with danger lurking beneath the surface, the shadow of crime never fades. Shen Yi, a cold-faced detective, uses his keen instincts and extensive experience to unravel the threads of each case. Reserved by nature, he is somewhat of a loner in his personal life, and his cases are his only solace. Su Ran, a passionate police detective, is sunny and cheerful, brimming with a sense of justice and always charging ahead with nimble moves. A bizarre string of murders shatters their once-parallel paths and binds them tightly together.
As their investigation deepens, the case grows ever more baffling. Every clue points in an unexpected direction, and it seems an unseen hand is pulling all the strings. As they pursue the truth, the two must face not only the criminals' cunning and brutality, but also the knots in each other's hearts. They support one another, moving from suspicion to trust as they join forces to overcome one challenge after another. Meanwhile, a shocking conspiracy gradually comes to light. It threatens the city's safety and tests their convictions and friendship.
