It was signed on 170425! It seems like OP’s dongsaeng is doing his service as well and that’s how he got it for her [cr: via @snxy]

Translation:

My bro got me Changmin’s autograph^-^ he said Changmin is the most good looking person he has ever seen in his whole life

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Credits:

ye_.0_0  via @snxy,
Translated by @amaiming,
Shared by TVXQ! Express