After graduation, Cho was selected as a TV actor by a public recruit of
Korea Broadcasting System (KBS), and officially debuted as a professional actor by starring as the youngest brother of
Yu In-chon in
The Age of Ambition (야먕의 세월). But theater remained his main priority, as Cho and his friends established a theatrical company named "Jongak" (종각, literally "Bell Pavilion"), which produced several works on the stage such as
Tricycles (세발자전거, 1989),
Look Back in Anger (성난 얼굴로 돌아보라, 1990) and
The Lovers of Woomook-baemi (우묵배미의 사랑, 1990). In 1991, Cho won Best New Actor in Theater at the
Baeksang Arts Awards for his acting in
Equus; he reinterpreted the leading role Alan Strang as an innocent person, though he is largely depicted as a cruel and rebellious character. In 2009, Cho revisited
Equus by directing the play and playing the other lead character Martin Dysart. This was part of the highly successful
Yeongeuk Yeoljeon ("A Series of the Best Plays"), of which Cho was the programmer in 2008–2009. Cho was praised for reinvigorating the faltering local theater scene in
Daehangno by coming up with the series and its star-studded casting, promotion and marketing. In 2018, Cho starred as a doctor and head of an organ transplant centre in the medical TV series
Cross opposite
Ko Kyung-pyo. However, on February 24, 2018, while the TV series was still being shot and aired, he was removed from the cast list following his admission of committing sexual harassment. ==Other activities==