Buying gifts and returning pearls, an ancient idiom in China, comes from Han Feizi. The original intention is to buy jewelry and leave only beautiful boxes, without real high-value jewelry. Often used as a metaphor for lack of foresight and improper choice.
Some Chu people sold their pearls to Zheng, which were Mulan's cabinets, decorated with cinnamon, pearls and jade, decorated with roses, and decorated with feather clothes and jade. Zheng Guoren bought the jewelry box and returned the pearls. This can be said to be a best seller, but it is not a good pearl.
A businessman from the State of Chu sold pearls in Zheng and made a box of magnolias. The box is smoked with osmanthus and pepper, decorated with beads and Baoyu, decorated with ruby and decorated with kingfisher feathers. Zheng Guoren bought his box but gave him pearls. This Chu man can be said to be good at selling boxes, not pearls.
Revelation: Zheng people only pay attention to appearance, not inner. It is also ridiculous that Chu people do not distinguish between primary and secondary.