Her father works as a schoolteacher and her mother is a homemaker. She has two younger brothers, Timmy and Nathan. As a young girl, Song wanted to do ballet, while her younger brother wanted to take taekwondo. She said, "My mom only wanted to take us to one place," so they settled on taekwondo. Although Song cried all the way through her first class,  she now holds a black belt in taekwondo.