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Using the 0.9--4.4~$\mu$m imaging data from the James Webb Space Telescope(JWST) Early Release Observation in the SMACS J0723.3-7327 galaxy clusterfield, we discuss the properties of three submillimeter galaxies (SMGs)detected by the Atacama Large Millimeter Array. These sources are magnified by1.4--2.1$\times$due to gravitational lensing. This is the first time that SMGhost galaxies are resolved in the rest-frame near-infrared (NIR). One sourcewas previous undetected by HST, while the remaining two are disk galaxies withS\'ersic indices of $\sim 0.9$ and star formation rates on or just below thestar formation "main sequence". Their submillimeter emission originates fromthe inner parts of the hosts, suggesting that their dust contents areconcentrated towards the center. The host half-light radii measured in therest-frame NIR are $\sim$1.5$\times$ smaller than those measured in therest-frame optical, consistent with a concentrated dust distribution. The moresevere extinction that optical light suffers towards the center makes itseemingly less concentrated. Therefore, we expect that the optically-baseddetermination of the stellar mass distribution within host galaxies could stillbe severely biased by dust. Interestingly, these two disk galaxies aredramatically different in their outer regions, with one being star forming andthe other being quiescent. Upcoming JWST observations of statisticallysignificant samples of SMGs will allow us to understand the correlation betweenthe dusty star forming regions and their hosts.

Properties of host galaxies of submillimeter sources as revealed by JWST Early Release Observations in SMACS J0723.3-7327