f(x)'s Amber reacts with her estimated age

The photo above that she uploaded on her Twitter revealed that she's actually f(x)'s maknae and not Krystal. In reality, Amber, who will turn 23 (international age) this September, is the second oldest in the group. However, she's only four years old on the said website.

Amber reacted along with the photo, "WHAT THE HELL AM I 4?!?!#llamaproblems."

However, Sulli is not included on the photo. So it's not yet conclusive. Let's see.