Seven years ago, undercover policeman Lin Ji died in the thick fog at dawn, leaving no trace of his body.
Seven years later, the serial killer "Chaoyun" committed a crime in the same misty morning, leaving a cloud pattern on the scene forever.
Lu Chao has been looking for Lin Ji for seven years. Until he walked into the used bookstore at the end of Qingshi Lane due to a murder case.
The bookstore owner Ji Yun is gentle and calm, but there is an old cloud-shaped scar on his wrist - exactly the same as the one left by Lin Ji when he shielded him from a knife.
"You open the door at five o'clock every morning. What are you waiting for?"
"Wait until the fog clears." Ji Yun smiled, "Although I don't know what will happen when the fog clears."
Lu Chao saw the sharp light in his eyes when analyzing the case, and saw his face suddenly pale when he heard a certain word.
I even saw that in the secret room on the second floor, which was never open to the public, there was a huge file wall that pointed to the truth seven years ago.
The morning clouds never disperse, and old friends will return home.
This time, I want to remember your name before the fog clears.
Purpose: Deliver positive energy