https://www.instagram.com/p/BSbFijAD98G/

Translation:

the (company) mates who are out on break

He also posted it on his facebook (here):

and twitter:

https://twitter.com/shfly3424/status/848875302843330562

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Credits:

Yesung’s Instagram (yesung1106) and facebook (예성),
Translated by @snxy,
Shared by TVXQ! Express