In 1997, on the eve of Hong Kong's return to China. In Lu Nian, a "New Territories resident" with a blank file was accidentally involved in a murder scene at Wan Chai Pier. The deceased was the "hyena" who sat in the club "He Lian Sheng", and Lu Nian held the only murder weapon in his hand - a gun belonging to the deceased. Wanted by the police and pursued by the underworld, Lu Nian was forced to flee, but he repeatedly escaped death by relying on unreasonable operations: instead of retreating according to the route planned by the police, he hid in the Kowloon Walled City that was about to be demolished; instead of negotiating with a backer, he took the deceased's account book and contacted his arch-enemy "Sin Antang" and the Independent Commission Against Corruption. Everyone thought he was trying to survive in the cracks, until the Superintendent of the Anti-Gangster Group discovered that Lu Nian, an "undocumented person", had actually entered the country three months ago, and every time he appeared, he accurately hit the turning point of all cases. Who is he? What exactly does he want? As the investigation deepens, a bureau about the ultimate secret is slowly closing its net.
