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Plot: In the south Yunnan region of China, how many unknown secrets are hidden in the middle of the deep mountains and dense forests. Pu Po, an old Yi traditional Chinese medicine practitioner and vice president of the county hospital, and Fang Wen, his unmarried son-in-law, who is a doctor, are walking among the mangrove mountains, searching for the secret recipe for treating bruises and gunshot wounds passed down by the old family of the caretaker of the forest