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We study a simplest viable dark matter model with a real singlet scalar,vector-like singlet and a doublet lepton. We find a considerable enhancement inthe allowed region of the scalar dark matter parameter spaces under theinfluence of the new Yukawa coupling. The Yukawa coupling associate with thefermion sector heavily dominant the dark matter parameter spaces satisfying thecurrent relic density of the Universe. Dilepton$+\slashed{E}_T$ signaturearising from the new fermionic sector can observe at Large Hadron Collider(LHC). We perform such analysis in the context of 14 TeV LHC experiments with afuture integrated luminosity of 3000 ${\rm fb^{-1}}$. We found that a largeregion of the parameter spaces can be probed by the LHC experiments. Theprojected exclusion/discovery reach of direct heavy charged fermion searches inthis channels is analyzed by performing a detailed cut based collider analysis.The projected exclusion contour reaches up to $1050-1380~{\rm GeV}$ for 3000${\rm fb^{-1}}$ for a light dark matter $\mathcal{O}(10)$ GeV from searches inthe $ pp \rightarrow E_1^\pm E_1^\mp, E_1^\pm\rightarrow l^\pm S \rightarrow ll+ \slashed{E}_T$ channel.

A new feasible dark matter region in the singlet scalar scotogenic model