Actress Hong Soo Ah has been busily supporting the debut of her labelmates CHI CHI in various event performances the past couple of month.�She's finally joined them on stage for today's episode of "Show! Music Core" for a surprise performance of their title track, "Don't Play Around"! A representative from their agency, Yedang Entertainment revealed to Star News, "Departing from the fact that they're labelmates, Hong Soo Ah and CHI CHI are more like close sisters.�In an effort to lend the girls a bit of strength, she's been joining them in their promotions despite her busy schedule.�She's put in a lot of sweat for this, so please look forward to it!" Check it out below! Source: Star News via Nate