Li Gang-ok represented her nation at international competitions. She made her ISU Speed Skating World Cup debut during the 1989-90 speed skating season in November 1989 in Berlin, Germany, in the 1500 metres and 3000 metres. She competed at the 1990 Asian Winter Games in the 1000 metres event (finishing 7th) and 1500 metres event (finishing 5th) and 3000 metres event (finishing 10th). She also competed at other international competitions.