The Britney-ism is the reason because at first I always skipped this song and "Cry cry" (which also includes the "latin" intro), of course ending to be trapped by MVs and even more by live studio performances guided by Hyomin's charme and EunJung's energy and sex appeal. These songs are not the only in K-Pop being "inspired" by western music, but I think that the source representation should be more subtle.