Hey, hey, man. What do you mean the disaster caused by the Zhang Yu moon is as soft as steel?

This is an allusion from traditional culture. The ancient steelmaking method was to beat pig iron repeatedly. Pig iron is very hard and brittle, and it will become elastic and tough after repeated beating, and it is used for steelmaking.

The ancients didn't know that the carbon content in iron had changed, and thought that it was an attribute of iron and would soften after long-term forging. So there is a proverb called "everything is soft around your fingers", which means that steel bars are soft around your fingers after everything is tempered, and hard things have a soft side.

Zhang Yu's lyrics don't mean to beat repeatedly, which means that when I see my lover, the moonlight is too beautiful and you are too gentle. Even though my heart is as hard as steel, I become gentle under the sweet words of vows of eternal love.