According to a representative from SBS, the 4 members - Irene, Wendy, Seulgi, and Yeri�- attended the recording for the show on February 6. Joy�was unable to join due to filming for her new drama 'The Liar and His Lover'.�

SEE ALSO: Seoul Philharmonic Orchestra reveals dramatic MV for Red Velvet's 'Psycho'

Currently, 'Running Man' is having 'Member's Week', where each member is creating a special of their own. However, 'Member's Week' will be taking a break on the upcoming episode for Red Velvet's surprise appearance.�

The episode with Red Velvet will be airing on February 12.�