According to previous studies, the El Nino Southern Oscillation (ENSO) does not appear to regulate TCactivity over Korea. By dividing the TC season into two sub-seasons, i.e. summer and autumn, we found the oppositeresponse of TC activity over Korea to ENSO phases between the sub-seasons. In summer, about 1.2 more TCs affectKorea during El Nino than during La Nina, while about 1.2 fewer TCs do so in autumn. The opposite responses toENSO could reduce the statistical significance of the relationship between ENSO and TC activity over Korea when theentire TC season (July to October) is considered. In summer, the southerly anomaly over the southern sea of the Koreanpeninsula due to the eastward retreating subtropical high allows a greater number of TCs to approach Korea during ElNino compared to La Nina. On the other hand, in autumn, the northwesterly anomaly due to the westward extension ofthe subtropical high leads to a smaller number of TC approaches.