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On June 18, former 4minute leader Jihyun reminisced about the 7 year anniversary of the group's debut stage through her Instagram. She wrote, "7 years ago today... I was so @nervous... and I was so very young then~~ Haha time flies.. ^^ Good day..!"

On June 18, 2009, 4minute made their official debut on 'M! Countdown' with "Hot Issue".