Light curve of KMT-2021-BLG-1898 constructed by combining the three data sets of the KMTNet telescopes: KMTA, KMTC, and KMTS. The inset shows the zoom-in view of the peak region exhibiting an anomaly feature. The curve drawn over the data point is a 1L1S model obtained by excluding the data points in the anomaly region. The colors of the data points are set to match those of the telescopes marked in the legend.