  I suggest a left-right mirror symmetric particle model as the natural and
aesthetic extension of the SM. As the left-right mirror symmetry breaking, the
tiny neutrino mass is generated by the radiative mechanism, the baryon
asymmetry through the leptogenesis arises from the characteristic decay of the
TeV-scale mirror charged lepton, and a KeV-mass sterile Dirac fermion
eventually becomes the CDM. The model can completely account for the common
origin of the neutrino mass, the baryon asymmetry and the dark matter,
moreover, profoundly uncover the internal connections among them. Finally, I
discuss several feasible approaches to test the model predictions and probe the
new physics by near future experiments.
