Light curve of the microlensing event KMT-2021-BLG-1547. The lower and upper panels show the whole view and a zoomed-in view around the anomalous region near the peak, respectively. The solid curve drawn over the data point is a 1L1S model obtained by excluding the data around the anomaly region of the light curve. The shaded region in the upper panel represents the duration of intensive observations, and the arrow indicates the position of a weak bump.