"That group of people, even during the Qin dynasty, were very active, and the most widely known among them was Xu Fu."
"The cave discovered by the ancestors of the Zhao family, it's unclear which alchemist left it."
"But in that place, the old ancestor of the Zhao family found the method to refine Yang Iron Sand."
"Yagyu Junichiro, on the other hand, acquired the method to forge another material, Yin Mysterious Metal."
"Once Yang Iron Sand and Yin Mysterious Metal were fused, they could even create a treasured material known as Yin-Yang Mysterious Metal."
Without Zhao Chunqiu having to continue the story, Su Fan could guess the rest.
Later, the Zhao family and Yagyu family from Japan were forced to cooperate.
Neither side could forge Yin-Yang Mysterious Metal on their own, a special material researched by ancient alchemists.
