  We use scanning tunneling microscopy/spectroscopy (STM/S) to elucidate the
atomically resolved electronic structure in strongly correlated topological
kagome magnet Mn$_3$Sn. In stark contrast to its broad single-particle
electronic structure, we observe a pronounced resonance with a Fano line shape
at the Fermi level resembling the many-body Kondo resonance. We find that this
resonance does not arise from the step edges or atomic impurities, but the
intrinsic kagome lattice. Moreover, the resonance is robust against the
perturbation of a vector magnetic field, but broadens substantially with
increasing temperature, signaling strongly interacting physics. We show that
this resonance can be understood as the result of geometrical frustration and
strong correlation based on the kagome lattice Hubbard model. Our results point
to the emergent many-body resonance behavior in a topological kagome magnet.
