If you are under 31 you can apply for a working holiday visa which grants you an availability to stay there under relatively lax circumstances but limits work t

If you are under 31 you can apply for a working holiday visa which grants you an availability to stay there under relatively lax circumstances but limits work to around 28 hours per week I think. https://whic.mofa.go.kr/eng/ https://whic.mofa.go.kr/eng/