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We investigate the previous microlensing data collected by the KMTNet surveyin search of anomalous events for which no precise interpretations of theanomalies have been suggested. From this investigation, we find that theanomaly in the lensing light curve of the event KMT-2021-BLG-1547 isapproximately described by a binary-lens (2L1S) model with a lens possessing agiant planet, but the model leaves unexplained residuals. We investigate theorigin of the residuals by testing more sophisticated models that includeeither an extra lens component (3L1S model) or an extra source star (2L2Smodel) to the 2L1S configuration of the lens system. From these analyses, wefind that the residuals from the 2L1S model originate from the existence of afaint companion to the source. The 2L2S solution substantially reduces theresiduals and improves the model fit by $\Delta\chi^2=67.1$ with respect to the2L1S solution. The 3L1S solution also improves the fit, but its fit is worsethan that of the 2L2S solution by $\Delta\chi^2=24.7$. According to the 2L2Ssolution, the lens of the event is a planetary system with planet and hostmasses $(M_{\rm p}/M_{\rm J}, M_{\rm h}/M_\odot)=\left( 1.47^{+0.64}_{-0.77},0.72^{+0.32}_{-0.38}\right)$ lying at a distance $\D_{\rm L}=5.07^{+0.98}_{-1.50}$~kpc, and the source is a binary composed of a subgiantprimary of a late G or an early K spectral type and a main-sequence companionof a K spectral type. The event demonstrates the need of sophisticated modelingfor unexplained anomalies for the construction of a complete microlensingplanet sample.

KMT-2021-BLG-1547Lb: Giant microlensing planet detected through a signal deformed by source binarity