A bizarre murder completely shattered the peace. Only an incomplete fingerprint was left at the crime scene, becoming the only glimmer of light that penetrated the fog. This fingerprint does not belong to any known person. Like a deliberately encrypted key, it cannot unlock the truth. Instead, it involves more intertwined mysteries - missing parties, tampered surveillance records, and workplace secrets that have been hidden for many years. All clues are wrapped around this fingerprint. Criminal investigation captain Lin Shen and his team are trapped in the vortex of fragmented narratives. Every breakthrough in fingerprint comparison is accompanied by new clouds of suspicion. When they think they are getting close to the truth, they find that there are still gray areas of humanity hidden behind the fingerprints, and the real murderer has already woven his own traces into this string of codes that no one can decipher.
