Due to an accident ten years ago, he was imprisoned by the reform law to decipher the mysterious code. The mysterious organization is brewing a shocking plan. A mysterious file that disappeared set off a bloody storm.
Returning to his hometown after eight years, he was overwhelmed by the familiarity he felt when he first met her. The mystery of the death of his former lover and the gang responsible for the murder eight years ago were all investigated to no avail.
Behind every case, there was always an invisible hand manipulating it. The case was complicated and confusing, and he fell into a quagmire of his secret feelings for her.
The truth came to light one by one, and he was in a life-and-death struggle with the real murderer. He was wandering between life and death, unable to find his past self or her now. Everything was different. He only held a dusty letter in his hand, which was yellowed.