이서구는 1920년대에 일본 유학 생활 중 유학생 신극모임인 토월회 활동을 하면서 문예활동을 시작했다.
Seo-gu Lee began his literary and artistic activities while acting in the Towolhoe, a new drama gathering of the overseas study students during studying abroad in Japan in the 1920s.