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Lepton number violation plays an essential role in many scenarios of neutrinomass generation and also provides new clues to search new physics beyond thestandard model. We consider the neutrinophilic two-Higgs-doublet model($\nu$-2HDM) where additional right-handed neutral fermions $N_{Ri}$ and acomplex singlet scalar $\sigma$ are also involved. In scalar sector, the global$U(1)_{L}$ symmetry is spontaneous broken, leading to Nambu-Goldstone boson,the Majoron $J$, accompanied by the Majorana neutrino mass generation. We findthat the massless Majoron will induce large invisible Higgs decay, and currentexperiments have already set constraints on relevant parameters. For the firsttime, we point out that the $\nu$-2HDM with $N_{Ri}$ can be distinguished fromother seesaw by the same sign tri-lepton signature $3\ell^\pm4j+\cancel{E}_T$.More interesting, for $\mathcal{O}(\keV)$ scale Majoron, it is a good candidateof decaying dark matter to interpret the $3.5\keV$ and $511\keV$ line excesses.

Global $U(1)_{L}$ Breaking in Neutrinophilic 2HDM: From LHC Signatures to X-Ray Line