In the city at two o'clock in the morning, there is a pair of eyes searching for those forgotten traces in the darkness.
His name is Zhou Jingyu, and he was once the youngest genius profiler in the police force. Due to a miscarriage of justice three years ago, he resigned and became the person pushing the cleaning truck late at night. Fingerprints on the inside of the window frame, hair in the cracks of the closet door, dirt in the cracks of the floor - behind every trace is an unfinished story.
Forty-seven cases, forty-seven farewells that no one saw. He used anonymous text messages to help the police solve the case, and hid in the night to say final farewells to those who died.
Until he met her - forensic doctor Su Youning, the one who brought him coffee late at night and walked with him through every street.
When the true colors of the six deadly sins (AVARITIA) were revealed one by one, and when the truth of three years ago surfaced, he realized: some traces can only be seen by the most humble people; and some sightings are destined to take a lifetime to complete.
Intention: No matter how deep the darkness is, there will eventually be light; no matter how faint the traces are, they will eventually be seen. On those nights when no one says goodbye, we light a lamp for them.