게 굴러가다

roll along; keep ticking over

굴러가다 is literally something rolling — a stone, a bike pedal, a pair of eyes — and the -게 adverb before it says how. Just as often it is figurative, for a life or a system that keeps running by itself: 제 24시간은 그렇게 굴러가요 'that's how my twenty-four hours roll', or a scheme that can run 안전하게 'safely'. The image is of something turning over under its own momentum rather than being pushed.