Check out HyoYeon's BTS clip and picture from SNSD's 'Lion Heart' MV

Joining TaeYeon and SeoHyun, here's HyoYeon with her behind the scene picture from SNSD's 'Lion Heart' MV. 

Meanwhile, the full music video of 'Lion Heart' will be released tomorrow at 12PM KST.

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Credits:
Hyoyeon's Instagram