Hyorin sang a request live on the September 8th installment of 'Knowing Brothers'.

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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!