The sound source of "Bad Girl" with Chung-ha and Lachika of Mnet's "Street Woman Fighter" will be released on various music sites at 6 pm on October 27th.

Before the release of the song, Chung-ha appeared together as an artist in Lachika's performance music mission in Street Woman Fighter, which aired on October 26th, drawing enthusiastic responses from viewers.

The song that Cheongha gave to Lachika was "Bad girl." Cheong-ha moved everyone by putting Lachika in the last part of the song, and Gabee blushed tears, saying, "It's the best gift I've ever received." Cheong-ha said, "It will be the most trembling, most proud sound source after recording. It doesn't make any sense if it's not my sisters. I've always been grateful for my gratitude, but I'm grateful that I can express it even a little," she said.