f(x)'s Amber sweetly showed her support for fellow group mate, Krystal, apparently on the set of her current SBS drama, 'My Lovely Girl'!

Amber uploaded a picture onto Twitter of herself holding up a sign that says, "You've worked hard, Princess Jung Soo Jung (Krystal)," with Krystal smiling next to her. �She repeated the words from her sign when tweeting the picture, making everybody go "aww" at their sweet friendship.�

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'My Lovely Girl' will be wrapping up on November 6.�