Red Velvet adds another tampil to their first ever solo concert. 

Red Velvet adds another show to their first ever solo concert.

Red Velvet has completely sold out the two shows of their concert.

The girls will be at the Olympic Hall on August 18th-20th for their first ever concert \'

Red Room\'. Originally, the girls were scheduled only for the 19th and 20th, but their concert was in such high demand that an additional date on the 18th was added.

SEE ALSO: Red Velvet and Park Mi Kyung collaborate on \'Fantastic Duo 2\'

Tickets to the additional concert will be sold on the 31st.

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