Hey, bro. What does it mean that Zhang Yu's moon caused trouble? No matter how hard your heart is as steel, your fingers are still soft.

This is an allusion from traditional culture. The ancient method of making steel was to beat pig iron repeatedly. Pig iron is very hard and brittle. After repeated beating, the steel will become elastic. , strong toughness.

The ancients did not know that this was a change in the carbon content of the iron. They thought it was a property of iron that would become softer after long-term forging, so there was a saying called "pure steel after a hundred refinements." "Round the finger softly" means that after hundreds of times of tempering, the steel bar can be so soft that it can be wrapped around the finger, describing that hard things also have a soft side

The meaning of Zhang Yu's lyrics is not repeated. The meaning of beating means that when I see my lover, the moonlight is so beautiful and you are so gentle. Even though my heart is as hard as steel, I become tender under the sweet words of eachother