  Higgsino has been intensively searched for in the LHC experiments in recent
years. Currently, there is an uncharted region beyond the LEP Higgsino mass
limit where the mass splitting between the neutral and charged Higgsinos is
around $0.3$-$1$ GEV, which is unexplored by either the soft di-lepton or
disappearing track searches. This region is, however, of great importance from
a phenomenological point of view, as many supersymmetric models predict such a
mass spectrum. In this letter, we propose a possibility of filling this gap by
using a soft micro-displaced track on top of the mono-jet event selection,
which allows us to discriminate a signature of the charged Higgsino decay from
the Standard Model background. It is found that this new strategy is
potentially sensitive to a Higgsino mass of $\lesssim 180$ $(250)$ GeV at the
LHC Run 2 (HL-LHC) for a charged-neutral mass splitting of $\simeq 0.5$ GeV.
