Ailee accompanied close friend Amber to a recent recording of KBS 2TV's 'Yoo Hee Yeol's Sketchbook' that aired on March 6 to perform "Shake That Brass" with her and also talk about their friendship.  

When asked what she could learn from Ailee, Amber said sweetly, "Unnie speaks with certainty: 'yes,' 'no.'  I always make decisions a bit ambivalently, so I envy her ability to make decisions with confidence."

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Asked the same question, Ailee revealed, "Amber's patience.  She has patience when dealing with people.  People take advantage of Amber.  There are a lot of people who take advantage of her kindness, and while Amber feels that herself, she accepts it all and endures it well."

MC Yoo Hee Yeol said, "People like that could get hurt a lot internally," to which Ailee said, "She does a lot."  Amber added, "Ailee is the same age as my real older sister.  She plays the role of an older sister for me in [my real sister's] stead," likely as her real sister is not often around due to Amber's immersion in the entertainment world.

Check out their performance together of "Shake That Brass" above!