Terrified of being killed if his true identity is discovered, Duan Ling assumes a false name and scrapes out a meager life in Wu Du's shadow. Yet the more he gets to know the prickly assassin, the more Duan Ling feels his rescuer can be relied on. When Wu Du's master sends the two on a dangerous mission together, Duan Ling must decide: Can this man who saved his life be trusted with it?