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The story takes place in the Western Han Dynasty. Mao Baijin, formerly known as Mao Guojin, is a descendant of Mao Sui during the Warring States Period. When Mao Baijin was fifteen years old, he joined the Mao family's Lishan blacksmith Master Wei and learned blacksmithing skills and martial arts. Later, he met the official Yao Wanli and helped Yao Wanli solve the mystery. Yao Wanli reciprocated and introduced a large ironware business to Mao's Lishan family. Mao Baijin is resourceful and selfless. He helps the blacksmiths solve problems and mediate conflicts and disputes. He has established a high prestige among the blacksmiths. He also founded the "Sandao" brand and continuously improved product quality. He also led everyone to carry products on shoulders, backpacks and horses to sell in other places, and mobilized everyone to attract foreign merchants to Maojia Lishan to purchase goods, making Maojia Lishan gradually become a nationally famous hardware market.