A Living Person Hidden in a Black Coffin: An Escort Job Uncovers an Eight-Year-Old Cold Case

The Ruan family escort agency is drowning in debt, and Ruan Qinghe, its female chief escort, accepts a job transporting a sealed black coffin. Along the way, she discovers that it contains a living witness to an eight-year-old case. To take him to Yunzhou to file a complaint, she breaks her contract and changes route. Now she must protect the witness while facing pressure from Guangshun Trading House to deliver the coffin by a deadline, as well as the threat of losing the family estate.

Tang Jiu, the dead man's daughter, refuses to entrust her father's death to one belated testimony. She takes out her own money and returns to the mountains to search for the abandoned coffin. One protects the witness; the other investigates. From signal times and two air vents to old accounts and documents, the source of every clue must be verified. As the testimonies gradually come together, Ruan Qinghe is forced to face the responsibility her father left behind: who missed that signal back then, and who paid for this black coffin?