He seems to be from the police department and the same person who posted selcas before with Changmin and called himself  a successful fan haha~

https://www.instagram.com/p/BTwBjT6hvE4/

Translation:

Saturday dinner with Changmin hyung👍👍
Thank you for your warm advice 😘
Next time, I’ll treat you 👬

The restaurant  is 경성상회 Kyungsung Izakaya, Gyeongbokgung station, exit 1 http://naver.me/G4AtrZiH

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Credits:

hyun_w2o : here,
Translated by @snxy,
Posted and Shared by TVXQ! Express