Singer Hwayobi guested on the September 28 broadcast of 'Radio Star', and as you may have guessed, the MCs tackled her with questions about her ex-boyfriend, Untouchable's Sleepy. 

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The MCs carefully brought up the topic by referring to Sleepy as ex-boyfriend S. At first, Hwayobi was hesitant to talk about her past, but then later shared about a time she coincidentally met him. 

Hwayobi said, "I coincidentally met ex-boyfriend S at a street stall. My singer friend Youngji owns one, and I ran into my ex there. All the attention was on us because we were there facing each other, and it was driving me crazy. It would be weird to greet him brightly or poorly, so I just said, 'Uh...Hi..'." 

We all know awkwardness like that lingers on, even though the couple broke up back in 2010.