SISTAR's Soyu recently uploaded cute photos of her puckering up for a kiss via Twitter. She also wrote a post regarding the release of her latest solo track for the "Playful Kiss" OST, "Should I Confess." Soyu optimistically tweeted, "I hope that all of you will show a lot of interest toward my first solo track, 'Should I Confess'." SISTAR's company, Starship Entertainment, revealed:

"Soyu's charming voice is nicely balanced in 'Should I Confess'. She thoroughly prepared to best express the lyrics, and she did so as if she were in the shoes of the drama's main female role."

Meanwhile, SISTAR is currently busy with promotions for their latest track, "Shady Girl."