[2] In September 2009 TS Entertainment announced that they will be debuting a four-member girl group in October 2009.

Hana debuted with the stage name of Zinger, along with Han Sunhwa, Song Jieun and Jun Hyoseong, as the group, Secret.

In January 2011 the group deviated from their "sexy" and "sassy" image and released "Shy Boy", a "cutesy" and retro-inspired song.

[5] Although they were worried with the 180-degree image transformation, the single exceeded their expectations as the song was a major success.

[5] The title track became another hit for Secret as the song reached number one on the Gaon Monthly Singles Charts and won them another trophy in SBS's Inkigayo.

The same year Secret began a foray of Japanese activities with the release of "Madonna" and Shy Boy.

Her mother was a singer who had passed the TBS Talent Exam and released a single in South Korea.

[9] On 11 December 2012 at 2am, Hana was involved in a car accident with the other Secret members, breaking her ribs and bruising one of her lungs.