SEE ALSO: 'Reply 1997's Seo In Guk, Eunji, Hoya, and more make cameos on 'Reply 1994'

On the December 14th 'Hug Day' special on 'Entertainment Relay', Seo In Guk shared with excitement, "Yes, I am holding a concert. It's my first solo concert. I kept talking about holding a solo concert and I finally was able to do it", and was asked, "Do you have a hidden card?" The singer got fans just as excited by revealing, "Girl group parody." When asked, "Which girl group?" Seo In Guk revealed, "They're on top these days, SISTAR. Give It To Me. I just want to dance freely... because it's my first solo concert."

Seo In Guk, who recently topped music charts with his duet with Zia, will also show off his dancing skills at his first solo concert, 'Surpri-In Guk' ('Surprise + In Guk') at Ewha Women's University, Seoul on December 28-29!

Check out Seo In Guk reveal his old school photos and serenade fans in the interview above!