On the May 12 airing of 'Super Junior's Kiss the Radio', Hwanhee shared the funny episode regarding Sunyoul's voice.
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DJ Leeteuk first made a comment to Sunyoul and said, "Your voice is so pure", to which Hwanhee chimed in with, "When I'm talking on the phone with my mom, she asks me if I'm with a girl." Sunyoul then added, "I jokingly say, 'Oppa who's that?'"
Hwanhee's mom probably thought Sunyoul was her son's secret girlfriend!