Actress Yoo In Na crying at IU's concert has become a hot topic.

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IU reminded fans of her close friendship to Yoo In Na when she thanked her at the '2017 MelOn Music Awards' on December 2. During her speech for 'Best Album of the Year' for 'Palette', IU expressed, "Though we're not blood related, she's my best friend and my #1 fan. I thank my muse, Yoo In Na."

Despite their 11-year age difference, it seems their friendship is as strong as ever, and fans are looking back at their best moments. Last year, Yoo In Na attended IU's '24 Steps: One, Two, Three Four' concert, and she managed to catch her eye during a performance of IU's song "The Shower".

In the middle of her song, IU smiled and let the audience know of the actress' presence, and Yoo In Na began visibly tearing up because of the touching moment. Yoo In Na was seen waving to IU afterwards as well. It's reported the two friends make sure to see each other at least once a week despite how busy they are. 

How sweet!