out of the field of view of our $J$ and $K'$ images, we can search for a counterpart only in optical $B$, $V$, $R_{\rm{c}}$, $I_{\rm{c}}$, and $z'$ images taken by FOCAS and SuprimeCam. In these images, a relatively bright galaxy, with $R_{\rm{c}} = 22.2$ with colors of $B-V=1.3$, $B-R_{\rm{c}}=3.0$, $R_{\rm{c}}-I_{\rm{c}}=1.0$ and $I_{\rm{c}}-z'=0.55$, is at nearly the SCUBA detection center. It has red colors, thus indicating a certain amount of dust obscuration. The SED fitting and photometric redshift estimate were carried out with hyperz (Bolzonella et al. 2000) with the information from these 5 bands. We had a fitting result with a dusty galaxy at low redshift(around $z \sim 0.6$) with $E(B-V) \sim 0.75$. It is a very possible counterpart for the sub-mm source, because it is believed to be suffering from large extinction by dust (figure 6). This galaxy is already listed in the catalog of the CNOC cluster survey (Ellingson et al. 1998), and its $r$ and $g$ magnitudes are 22.53 and 24.23, respectively, without information about the redshift. Since there is no information on near-infrared nor radio wavebands for the objects, it is very difficult to identify a secure counterpart. The possibility of a sub-mm object lensed by 