During a live airing of 'Lee Guk Joo's Young Street' on July 11, a listener asked, "How did you save your members' names in your contacts?" Sunmi responded unexpectedly with, "I don't even know Yubin unnie's cell phone number." 

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She then explained, "Yubin unnie got a new phone not too long ago, and since we are currently promoting, there's no need to know her number because I see her everyday." 

Makes sense..?