On that snowy night five years ago, Lin Xia lost her best friend and her confidence as a criminal police officer. The case remains unsolved, the murderer is at large, and she can only leave the police force with trauma and guilt.
Now, another snowy night has fallen, and new victims have appeared in the city. The young woman's body was found on a snow-covered park bench, next to a delicate ice crystal snowflake - exactly the same as the case five years ago. The police were helpless, but Lin Xia knew that this was the murderer challenging her.
Despite the fear in her heart, Lin Xia decided to return to the investigation. She discovers that each new case is closely connected to some fragment of her past: her high school classmates, her former colleagues, and even her psychiatrist. The coldness of the snowy night seemed to penetrate into her bones, and the shadow of the murderer was everywhere.
As the clues were gradually pieced together, Lin Xia realized that this was not just a revenge, but also a carefully designed psychological game. The killer is exploiting her trauma to lead her toward a deadly trap. When the final truth is revealed, she will have to face a cruel fact: the real devil may have been beside her all along.
In this snowy night full of lies and betrayal, Lin Xia must overcome her inner demons in order to stop the next victim - perhaps, herself.
