Jiao Xu, the child star who plays Stephen Chow's son in Changjiang No.7, was originally a daughter. In the play, Stephen Chow has deep feelings for her father and son, and Stephen Chow takes Jiao Xu as his adopted daughter. It is understood that Stephen Chow originally wanted to find a boy to play. However, he interviewed thousands of child stars, but couldn't find a candidate. Instead, I went back to my hometown and met Jiao Xu. It was love at first sight, and I decided that the girl would perform cross-dressing.