Translation:

I heard from my eonni who visited Seoul recently. After the concert on April 1, around the time that Yunho took a long break, Yunho and Changminwent to a restaurant (samgyeopsal, KOR BBQ) pretty late at night.
They were alone. Just the two of them.
the restaurant people told her about that.

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Credits:

Fanaccount by @peamo228,
Translated by @beriko0214,
Shared by TVXQ! Express