The 2017 SHILLA Duty Free FAN FESTIVAL with TVXQ! U-Know in SEOUL was held on 18:00 at Kyunghee University, Hall of Peace (for about 2000 fans)!

Why? Keep Your Head Down dance break

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EDIT:

this one too~

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Credits:

Fancam by @W_crown26218: here,
Shared by TVXQ! Express