Deviation of stellar metallicity from the simulated quiescent median relation as a function of stellar mass for compact galaxies at different redshifts. Each point represents a galaxy, color-coded by redshift. The Δ dex values correspond to the offset from the running median of the quiescent population at the same redshift. The dashed gray line marks Δ dex = 0, indicating no deviation from the reference relation. Compact galaxies at all redshifts tend to be more metal-rich than typical quiescent systems at the same mass, with the most pronounced offsets seen at lower redshifts.