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Seo Jang Hoon expressed he missed SISTAR's summer songs and that this past summer was even more sweltering without their refreshing hits. Hyorin then covered Shim Soo Bong's 1989 hit "That Person", and as soon as she started, Kang Ho Dong commented, "Is this live?"
In related news, Hyorin made her solo comeback with "BAE" last month. Check out Hyorin's amazing live on 'Knowing Brothers' above!