On this week's episode of 'Fantastic Duo 2', Red Velvet's Wendy and Seulgi collaborated with Kangta.

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For an opening performance, the three artists sang one of Kangta's hit tracks called "Doll". The song is originally sung by three male artists but when Seulgi and Wendy featured on the track with their beautiful voices, they were able to add their own colors to the song. The audience watched in amazement and couldn't help but cheer at the end of thier performance.

Watch the clip above.