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Large-scale cluster potential is known to plays a significant role in the morphological and colour transformation of galaxies. However, the effect of environment on gas-phase chemical abundance remains observationally inconclusive. The new generation of cosmological simulations are ideal laboratory to test and make prediction about physical drivers of chemical evolution in high density environment. In this talk, I will present my work with IllustrisTNG simulations, where I find that cluster galaxies at z<1.5 are systematically 0.10-0.15 dex metal rich compared to field galaxies, particularly for the stellar mass <10^10 Msun. Our analysis predicts a systematic signature of ``chemical pre-processing’’, i.e., signs of metallicity enhancement appear before galaxies fall into the central cluster potential. Using tracer particles, we identify that the inflow of enriched gas and reduced gas inflow rates drives the chemical evolution of galaxies destined to be in the high density environment.

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