When Go Soo first came to Seoul, he acted on stage, but he lacked money that time. Since he lacked money, he decided to put his stage acting on hold for later and eventually stopped. From then on, he began presenting his profile photo to numerous agencies. Go first appeared in a soft drink TV commercial, followed by a role as an extra in the 1998 music video "Last Promise" by the band Position. He made his television debut in 1999 through the MBC sitcoms "My Funky Family" and "Jump" and KBS2 drama series "Ad Madness".