Video:

Regarding the text at the end of the mission, it seems that a “new BE Mission series ‘Gold Mission’ will be uploaded every 2nd and 4th Wed of the month starting this month until 6/30/2017”

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Credits:

Bigeast Official Website,
Video by @smilessi of TVXQ! Express
New series Info by @LuvTV2XQ
Shared by TVXQ! Express