f(x)'s Amber wished late member Sulli a happy birthday.

On March 30, Amber made the below post on her Instagram story, dedicating it to late f(x) member Sulli. She shared a photo of the two together along with the message, "Happy Birthday, younger sister."

Sulli suddenly passed away in October of 2019, but she would've celebrated her 28th birthday this past March 29. 

Take a look at Amber's post below.