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There is a rumor in the world that Chen Yi's sword and Chu's crazy smile. Chen Yi, an assassin whose origin is a mystery, is calm and stoic. His knife can kill people as well as save people. Chu Kuanghe Beisha was a man of unparalleled martial arts skills and unruly spirit, but he suffered from a strange disease and needed to take elixir every fifteen days to survive. One day, He Beisha sent someone to find Chen Yi because the elixir he relied on to survive had been stolen. Their story begins here...