Luna and her twin sister pose sweetly together for the camera

SEE ALSO: NMIXX's Sullyoon is seen shaking in fear during a performance due to her intense fear of heights

On her Instagram, Luna wrote a heartfelt message to her sister that went, "The first photo shoot with Jinyoung unnie whom I love. [She] must have been tired since the filming began early, but she never stopped smiling, which I was touched by. Let's treat our grandmother well in 2015, be filial to our parents, and spend [the year 2015] happily I love you," along with a picture upload of the two smiling sweetly into the camera.�

Luna's loving words toward her sister attest to the close sisterly bond that they two siblings share. Let's hope Luna and her sister will continue cherishing each other!

???? ?? ????? ? ?? <3 ?????? ?? ??? ?????? ,, ?? ???? ??? ?????,, ?? ?? 2015? ?????? ???, ???? ???? ???? ??? ???.

A photo posted by ??? (@fx_luna_sunyoung) on Jun 29, 2015 at 4:33am PDT

Sweet.

A photo posted by ??? (@fx_luna_sunyoung) on Jun 29, 2015 at 5:21am PDT