On the 3rd, on MBC FM4U "FM Music City It's Sung Si Kyung," Sung Si Kyung said that "People have been complaining about BoA's lip sync. BoA is not a robot. Depending on the performance, to show all the choreography, you might have to lip sync. Doesn't everyone know that BoA's good at singing? People want to much sometimes" as he introduced BoA's new song "Only One."

Prior to this, BoA created an issue with her lip sync on her "Only One" come back stage. Some of the internet users commented about how she lip synced, who has once been the judge of SBS "K-Pop Star," and BoA said that "No one can dance perfectly with singing live. My performances will be centered around the choreography and it will be sung lip sync."