We don't know what's in it or what it's for, but she did explain in her caption, "My mood is happy after getting this gift from Hye Jung unnie. Unnie Fighting. Sung Hee is cheering you on. #Hye Jung Unnie you're paying your taxes well right #Yoo Hye Jung #Doctors #What's the gift #It's not snacks." Of course, the box also reads, "To Choi Sooyoung, From Park Shinhye."

Currently, Park Shin Hye is playing the role of Yoo Hye Jung in her drama 'Doctors', while Sooyoung is playing the role of Chun Sung Hee in '38 Police Squad'. It seems like the two close friends are cheering each other on!

Are you keeping up with Sooyoung's and Park Shin Hye's dramas?

SEE ALSO: Son Ye Jin ♥ Hyun Bin celebrated their son's 2nd Birthday with a stunning cake

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A photo posted by Sooyoung Choi (@hotsootuff) on Jul 28, 2016 at 8:24pm PDT