f(x) Amber posted on her twitter, "Thank you for sticking by us for 3 years. I love you all."
She also posted, "Tears of emotions," along with a photo. In the photo, she has taped tissues underneath her eyes to mimic the look of tears. miss A member Min commented on her photo with, "Congrats!"
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f(x) debuted in 2009 with their digital single, La Cha Ta.