[This Day] SNSD Hyoyeon released her 'MYSTERY' MV

Four years ago, today, December 1st, SNSD's Hyoyeon released her solo track titled 'MYSTERY'.

It was part of the songs which were released during the first season of SM Station.  As of now, the MV has already accumulated over 10 millions.  

Let's all unveil the mystery once again as we check out Hyoyeon's music video below~

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