We analyze an extremely deep 450 mu m image (1 sigma = 0.56 mJy beam(-1)) of a similar or equal to 300 arcmin(2) area in the CANDELS/COSMOS field as part of the Sub-millimeter Common User Bolometric Array-2 Ultra Deep Imaging EAO Survey. We select a robust (signal-to-noise ratio >= 4) and flux-limited (>= 4 mJy) sample of 164 submillimeter galaxies (SMGs) at 450 mu m that have K-band counterparts in the COSMOS2015 catalog identified from radio or mid-infrared imaging. Utilizing this SMG sample and the 4705 K-band-selected non-SMGs that reside within the noise level