She shared a mosaic photo with different photos in it. The photo that stand out was the one in the middle where Luna is posing with her twin sister.
Luna spended some time with her family on Chuseok and it looks like she had a lot of fun with her Jinyoung unnie.
f(x) fans left comments on the page saying they looked cute and beautiful.
Source: Nate + me2day/fx_Luna