Mushroom farmer Zhang Jianjun received help and got out of trouble from Liu Zixin, but mistakenly thought the other party was making a profit from it, forced him to make up the price difference and then dumped the middleman to do business by himself. He was greedy for profit, raised prices randomly and substituted inferior goods with good ones, and finally the mushrooms rotted in the shed and all customers were lost. Liu Zixin discovered the down-to-earth Shen Yuan, adhered to quality and reopened the supply channel. Zhang Jianjun's successive calculations eventually lost everything, while Liu Zixin took Shen Yuan to do better and better, eventually driving the whole village to develop together and becoming a well-known mushroom supply village.