Our hardworking boy investing time during enlistment to work on his musical skills ;;

Translation:

Previously, fan had talked with the police promo unit captain at an event and he’d said Changmin was diligently practising the guitar and piano.  Fan had wanted to convey worries that changmin had been getting too thin but the captain said he was managing his body as he was a celebrity.

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Credits:

Fanaccount by @murasakiline,
Translated by @snxy,
Shared by TVXQ! Express