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EDIT:
It looks like he is Changmin’s SMPA batchmate

Translation:

TVXQ Comeback Live Concert 🎈Thanks for the nice seat, Changminni-hyung❤At backstage after~

[cr: KR-JP Translated by @Shim_Ls2v2, JP-EN Translated by @joeylfy]

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[cr: sw_kkang: here, here, and here]

TVXQ! leaving stage

[cr: sori.kwak: here]

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Credits: