Super Junior's Heechul boasted his close relationship with SISTAR by joking around with them and even poking fun at Soyu when he appeared on SISTAR's recent interview to commemorate their mini-album, 'Shake It.'

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He said, "I'm close to all the SISTAR members. �Although they're super big stars right now, when they were only super stars, I appeared in their MV for 'Shady Girl.' �In the MV, Soyu sat on my knees and since then, my knees have been hurting when I walk," making everyone laugh.

Oh, classic Heechul! �For memory's sake, revisit "Shady Girl" down below.