Kyuhyun the Two-Timer?

Sunny: I'm angry. You had a kiss scene and a bed scene with me and you're dating her [Seohyun]?

Suju Talk #49: "You're Super Junior's Kyuhyun?"

MC: S.E.S. is probably the group that set the foundation for SM Entertainment.
Kyuhyun: That's right.
Bada: Kyuhyun-ssi, you’re from SM? You’re that Super Junior's Kyuhyun?
Kyuhyun: .....Yes, I'm that Kyuhyun.
Bada: You just had this ‘force’ of a solo artist so I really didn’t know.
Kyuhyun: Actually, I liked Fin.K.L better than S.E.S.
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Kyuhyun: I also like Kara’s Goo Hara.