Fans demand a Hyolyn-Soyu sub-unit after 'Growing' duet

Why are SISTAR fans demanding a HyolynxSoyu sub-unit suddenly?

It's because the two wonderful female vocalists take their own rendition of K.Will's song 'Growing' in a piano cover and it's just wow!

The SISTAR divas soften their vocals in this melodic and mellow track. Hyolyn and Soyu's melodies and harmony flawlessly produce a very aweing performance that blown fans away and make them demand a vocal sub-unit consisting of Hyolyn and Soyu.

Watch their impressive performance to find out!