In September 2008, she returned with the single "미쳤어" ("Crazy"). The song featured a "chair dance" that has become popular with the Korean public; it has since been upgraded to a "sofa dance". The dance has been copied and parodied by many people, including Hyun Young, Infinity Challenge comedy team member Noh Hong-cheol, comedienne Shin Bong-sun, and Lee Soo Young.
Her follow-up song in 2009, "Toyoilbamae" (Korean: "� 요일밤에", "On a Saturday Night"), was a success.
She then released her next EP, The Queen, which was not as well-received as her previous hits; she faced netizen criticism for her vocals, as well as accusations of plagiarism for "Queen", the lead single from the EP.