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The collector''s uncle, who kept an ancient secret, had no children and hoped his nephew could inherit the secret. However, the nephew was not interested at all. He only cared about developing new weapons, making more money. That was his only pleasure. But during the process of passing down the ancient secret, something unexpected happened. The nephew crossed over into the Warring States period. Ha! Since I''m here, I''ll make the most of it. As a weapon expert, dealing with cold steel shouldn''t be a problem, right? You have cavalry, I have machine guns; you charge, I''ll lay landmines and barbed wire; you retreat, but I''m an expert. There are tanks on the ground and planes in the sky. Surrender! What''s the point of using mechanized weapons on an ancient battlefield?