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We propose a novel possibility to detect a very distinctive signal with morethan four muons originating from pair-produced vector-like leptons decaying toa muon-philic $Z^\prime$ boson. These new particles are good candidates toexplain the anomalies in the muon anomalous magnetic moment and the $b\tos\ell\ell$ processes. The doublet (singlet) vector-like leptons lighter than1.3 (1.0) TeV are excluded by the latest data at the LHC if $\mathrm{BR}(E\toZ^\prime \mu) = 1$. We also show that the excess in the signal region with morethan five leptons can be explained by this scenario if the vector-like leptonis a weak singlet, with mass about 400 GeV and $\mathrm{BR}(E\to Z^\prime \mu)= 0.25$. The future prospects at the HL-LHC are discussed.

$\ge 4 \mu$ signal from a vector-like lepton decaying to a muon-philic $Z^\prime$ boson at the LHC