f(x)'s Victoria and Amber wished each other good luck, and fans are wondering if they're hinting at their comeback.

Victoria updated her Weibo account with the short and sweet message, "Good luck," and shared a snapshot of her and Amber with adorable expressions. Amber later also tweeted, "Good luck," with the photo below.

f(x) recently performed as the representative K-pop artists at the 'SXSW' event, and they now seem to be gearing up for their comeback with choreographer Kevin Maher.

Fans were happy to see their sisterly love, commenting, "Their expressions are cute," "It's nice to see the f(x) members' close friendship,"and "They look like sisters."

Be on the lookout for more details on f(x)'s comeback!