Song's bare abdominal muscles are the stage of "Ace Boy Acceleration". "Ace Boy Acceleration" is a derivative program of "Ace to Ace", and Song also showed his solo dance solo for the first time in "Ace to Ace", in which he also performed very well. Because this dance is sultry and sexy, Song, who is usually as cute and sweet as a little angel, also showed her sultry side and made a gesture of pulling her coat in the dance. This action also exposed a part of Song's stomach. After taking a screenshot of the fans, I found that Song actually has good abdominal muscles. It can be seen that the muscle lines of his abdomen are very good, which also makes people feel that he is particularly looking forward to it. This action shows the abdominal muscles.