Translation:

As he was on a break, I thought he would want to play but instead, as he needed to maintain himself for the future, the Shim Chwang who again returned and diligently exercised ^^
Although he is a dongsaeng, he is really outstanding and is worth emulating. Just as expected of TVXQ~~

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Credits:

Nae Jongseok’s Instagram (naejongseok),
Translated by @snxy,
Shared by TVXQ! Express