Wonder Girls, the first member, devoted herself to losing weight after joining JYP, and lost many little girls who danced well. Although they look tough, they are also children who like to hide their charm. Even though she was in poor health, she didn't say it in order not to worry everyone. She fainted many times during practice. But I didn't let my family know that I finally fainted after recording Music Center and was taken to the hospital backstage, and was finally asked to leave Wonder Girls for rest. The poor Mustang finally quit the team, and the fans launched a signature action on the Internet. Unfortunately, the company issued a statement that Mustang will never return to the team. Generally speaking, this is a physical problem.