During DIA's showcase for 'Happy Ending' on June 14, the girls addressed the similarities between their recent comeback and G-Friend's concepts briefly.

When told, "The new song is similar to G-Friend's song," leader Eunice said, "When we first heard it while preparing it, we likewise thought that it was similar to senior, G-Friend. However, we will work hard in order to emit it with an atmosphere unique to DIA."

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The group also said that they would appeal to the public with their own charms.  Heehyun said, "Chaeyeon has feminine, cute, and bizarre sides.  Eunice, as the leader, is someone filled with talent.  Maybe it's because I do the rap, but I think I have a strong energy.  If we appeal with a variety of images like these, we believe that we can be differentiated from the other girl groups."  But the other girl groups all say they have those charms, too...