Yoo In Na took her friendship with IU to the next level after the "Bo Ra! Deborah" star pranked the singer-actress.

The 40-year-old beauty is definitely one of the closest friends of the "Hotel Del Luna" star.

In fact, fans have seen the duo on various interviews and YouTube videos together several times, as they showed off their unique and genuine friendship.

However, Yoo In Na tested their closeness after she poked fun at IU.

IU Shows How Clingy She is With Her Best Friend Yoo In Na

During her appearance in "IU's Palette," the singer-actress reacts to her friend's statement that she "hardly gets upset with others."

IU confirmed it, but it seemed like this response was only applicable to Yoo In Na.

"But there is another thing that applies to only you," she said, adding, "Whatever you do to me, I never find you annoying. And I think that is your talent."

However, she is different with her other friends, as IU revealed that she would "scold" them if they appeared late.

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Written by Geca Wills