How did Zheng Shuyi hurt his hand?

When Xu Yuling closed the door, Zheng Shuyi accidentally grabbed his hand.

According to douban. In the 34th episode of TV series "Taking Love as a Camp", Zheng Shuyi decided to move into the banquet hall. In the process, I accidentally stuck my hand in Xu Yuling's closed door. I can't work normally with my hand injured, but I'm still worried about the company and ask Tang for help.