Left panel: Ram pressure as a function of halo virial mass. The ram pressure is estimated using representative values of gas density and galaxy velocity within 0.2 − 0.5 R_vir of each halo. The blue shaded region shows the range of ram pressures measured from the NEWHORIZON2 group halos, while the red shaded area represents those from cluster halos in Choi & Yi (2017). The dashed line represents a power-law fit to the halos, yielding $P_{\mathrm{ext}}\propto M_{\mathrm{vir}}^{1.01}$. Middle panel: Gravitational pressure of normal satellite galaxies as a function of their stellar mass (gray circles). The power-law fit to the normal galaxies (black dashed line) is $P_{\mathrm{grav}}\propto M_{\ast }^{0.6}$, with a lower power index than the external pressure of halos. Right panel: Ratio of external to gravitational pressure using the fits on the stellar mass-halo mass plane. The background color represents this pressure ratio; the bluer regions indicate that external pressure exceeds gravitational pressure. The upper bound of the virial mass of the NEWHORIZON2 halos is indicated by the blue solid line. In these halos, satellite galaxies with M_* ≲ 10^8.4 M_⊙ may experience external pressure that exceeds their gravitational restoring force.