Physical properties of HPC1001. Left: dark matter halo mass for (proto)clusters and groups in literature and this work. Blue- and red-dashed lines show critical masses of the cold stream and shock from simulations in Dekel et al. (2013). Middle: SFR vs. stellar mass. The solid line with a shaded area indicate the star-forming main sequence (MS) at z = 3.7 and its 1σ scatter (Schreiber et al. 2015), respectively. Individual sources in HPC1001 are shown in green filled circles with their ID labeled with text. Right: dust to stellar mass ratio M_dust/M_* as a function of stellar mass. Main sequence scaling relations are color-coded in redshift. Dashed and solid lines show main sequences from Kokorev et al. (2021) and Tacconi et al. (2020), respectively. The square and triangle show quiescent galaxy samples in literature. HPC1001.b shows comparably low f_dust as quiescent galaxies at z ∼ 1.5 with respect to MS.