The super geomagnetic storm in May 2024 (Dst index, Disturbance Storm Time index below -400 nT) significantly affected the low latitude ionosphere. Using 1 Hz Global Navigation Satellite System (GNSS) data from 18 Continuously Operating Reference Stations (CORS) in Hong Kong, Vertical Total Electron Content (VTEC) variations, ionospheric gradients, and scintillation responses during the storm is analyzed. Results showed intense VTEC fluctuations and electron depletion in the main phase, followed by multiple negative storm events in the recovery phase. Ionospheric gradients remained stable overall but exhibited stronger east-west variations during the recovery phase. Scintillation events mainly occurred in the initial and recovery phases, closely linked to nighttime ionospheric dynamics. new insights into multi-scale ionospheric responses is provided to extreme geomagnetic activity.