Both girls competed in rhythm gymnastics during the '2016 ISAC.' Cao Lu placed second and Cheng Xiao placed first. During a radio show, Cao Lu said, "Cheng Xiao is a wall that can't be surmounted. She was so good. I was proud seeing that my hoobaes were doing so well. It made me feel like I should work harder, too."
When asked what the FIESTAR members said to her to support her, Cao Lu laughed and said, "They told me not to break any bones. I was the oldest one competing."