After the pair filmed HyunA's music video for "Bubble Pop" together, rumors had spread that the pair were dating. 

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To accusations that the pair were being especially touchy while together in an airplane, Lee Joon explained, "It's true that we sat next to each other on the plane coming back after we filmed the MV. But it would be weirder to sit apart after we got close filming the MV. But I think the stewardess mistook what happened after watching us take a selca together."

He added, "It's true that we're close, but we're definitely not dating. She's way too young."