(Jiro Wang, Fahrenheit) Why did Brother Dadong hurt his leg?

It is because I often run around wearing leather shoes when filming, which leads to a bone injury in my knee for half a month. His leg didn't fully recover. He gave up the operation for Fahrenheit, and it would hurt if he stood for a long time or it was cold. If you pay attention, you will find that he often wears knee pads. Last year, he personally told his fans that the injury could not be cured.