IU and Yoo In Na denied secretly smoking cigarettes together.

On the April 4th episode of IU's YouTube series 'IU's Palette', the singer-songwriter's well-known best friend Yoo In Na featured as a guest and discussed their friendship. IU expressed, "When I go on a national tour, Yoo In Na comes to all the performances."

The two also faced keywords about their friendships, and to the keyword "secret cigarette," Yoo In Na responded, "Us? We don't smoke. I think they think we secretly smoke cigarettes." IU added, "We don't. That's a misunderstanding. We both use our voices for our professions."

However, IU later figured out the keyword was "in charge of visuals" instead. 

Watch Yoo In Na's episode of 'IU's Palette' above, and make sure to turn on the English captions!