Several netizens claim they've recently spotted the two idol stars during MV filming. According to reports, the girl with the blue hat is Moon Byul and the one with the red hat is Seulgi.�

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Back in January, RBW Entertainment confirmed that the Red Velvet�member will be featuring in Moon Byul's solo track.�

Seulgi and Moon Byul have worked together and built a strong friendship through�KBS�variety/drama show 'Idol Drama Operation Team'.�

Stay tuned for more details on Seulgi x Moon Byul!