  We investigate the possibility to identify the nature of spin of exotic
charged particles at the future $e^+e^-$ collider in $l^\pm+2j+MET$ final state
choosing IDM and MSSM as examples for the new physics models with scalar and
fermionic exotic charged particles, respectively. We choose four benchmarks for
the mass parameters for a significant deviation from the SM $W^+W^-$
background. We find that the $\cos\theta$ of $W$ boson constructed from $jj$
pair and lepton have the potential to identify the MSSM signal compared to the
IDM signal in longitudinally polarized initial beams. A more robust comparison
is seen in the shape of the azimuthal angle of the $W$ boson and charged
lepton, which can identify the IDM signal further if the beams are transversely
polarized.
