UV continuum slopes of our sample (red squares) as a function of UV magnitude. We calculate the UV slope by fitting the photometric fluxes in the filters covering the wavelength range of 0.13 μm < λ_rest < 0.31 μm with a power-law. We compare these to literature values of field galaxies (FGs) measured from photometry (Austin et al. 2025, black stars) and stacked spectroscopy (Roberts-Borsani et al. 2024, black circles). At the UV-bright end, our protocluster-resident sample lies above the M_UV − β relation seen in the field, and is largely inline with the relation seen in PRGs in simulations (Morokuma-Matsui et al. 2025, dashed black line). This appears to indicate that our protocluster sample is more dust enriched than field galaxies in the literature, potentially evidencing their more evolved nature.