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We have numerically investigated the unique effects of the core-shell nanoparticles on the integrated microdisk resonator. By attaching the core-shell nanoparticle to the disk resonator with gold core and polymer shell, the coupling between the disk resonator and the core-shell nanoparticle results in shift of the resonance wavelength of the disk resonator, depending on the core size/shell thickness of the nanoparticle. An invisibility phenomena found from the coupled core-shell nanoparticle and integrated disk resonator system is emphasized; at certain core size/shell thickness ratio, compared with the original resonance wavelength without core-shell nanoparticle, there is almost no resonance wavelength shift observed. The detailed interaction mechanism between the disk resonator and the nanoparticle is revealed in the electromagnetic field intensity distribution at the resonator resonance wavelength. The dependence of the position and number of core-shell nanoparticles is also discussed. Future studies on this coupled photonic systems will stimulate wide variety of applications.