To combat an increasingly powerful international drug trafficking syndicate, five East Asian nations dispatch special envoys to S City to coordinate a major crackdown with local police. However, the criminal organization strikes back, sending a deadly female assassin known as Mermaid to infiltrate the city. Joining forces with local criminal networks, she plots to assassinate the envoys and seduce a senior special police officer. As the authorities struggle to dismantle the syndicate, a ruthless battle unfolds, with both sides risking everything in a deadly confrontation.
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