Xue Bushi has a magical box that allows nails to be driven into objects exactly according to the original angle. It can turn a kitchen knife into an absolutely safe tool that automatically avoids human hands. It can also turn the sugar that causes toothache into a "good medicine" that reduces swelling and pain and has immediate effects. But it wasn't until he put a medal inside that he realized that the box was not as simple as "making use of each other's strengths to offset weaknesses."
This is the story behind the medal.
Intention: To remind people of those years is its greatest significance.