Lensing light curve of KMT-2021-BLG-0284. The lower panel provides an overall view, while the upper panel offers a zoomed-in perspective of the anomaly region. Arrows labeled t₁, t₂, t₃, and t₄ indicate the times of the caustic-crossing features. Insets within the lower panel present an enlarged view around each individual caustic peak. The colors of the data points correspond to the telescopes and observation fields, as indicated in the legend. The solid curve overlaying the data points represents the best-fit 2L2S model, while the dotted curve depicts a 2L1S model derived by fitting the data, excluding those around t₂ and t₃.