National Security Bureau elite Ning Zhao received the last mission: to approach the man who covered the sky with one hand and investigate the truth behind his father's death.
Duan Chenzhou was a gentle antique dealer in front of him, but a ruthless young gangster behind him. During a confrontation at an auction, he recognized the injury on Ning Zhao's shoulder - exactly the same as the mysterious man who saved him on a rainy night three years ago.
"Captain Ning, you want to convict me and save me at the same time?" Duan Chenzhou pressed him against the cold glass of the secret room. Behind him was the national treasure stolen goods that could subvert everything. "Why don't you guess who my father was referring to when he said 'The rusty blade cannot be trusted' before he died?"
When the truth was revealed, Ning Zhao discovered that the suicide note he had locked in the drawer was actually the cage that trapped Duan Chenzhou for his whole life. The director's final order was cold and ruthless: "Nightingale, either come back with the head of the 'Rusty Blade', or... You will become him next."
That night, it rained heavily. He did not hesitate to pull the trigger, but he pointed at the common enemy.
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