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Dusty Star-Forming Galaxies (DSFGs) are amongst the most massive and activestar-forming galaxies during the cosmic noon. Theoretical studies have proposedvarious formation mechanisms of DSFGs, including major merger-driven starburstsand secular star-forming disks. Here, we report J0107a, a bright ($\sim8$ mJyat observed-frame 888 $\mu$m) DSFG at $z=2.467$ that appears to be a gas-richmassive disk and might be an extreme case of the secular disk scenario. J0107ahas a stellar mass $M_\star\sim5\times10^{11}M_\odot$, molecular gas mass$M_\mathrm{mol}\sim(1\textendash6)\times10^{11}M_\odot$, and a star formationrate (SFR) of $\sim500M_\odot$ yr$^{-1}$. J0107a does not have a gas-richcompanion. The rest-frame 1.28 $\mu$m JWST NIRCam image of J0107a shows agrand-design spiral with a prominent stellar bar extending $\sim15$ kpc. ALMAband 7 continuum map reveals that the dust emission originates from both thecentral starburst and the stellar bar. 3D disk modeling of the CO(4-3) emissionline indicates a dynamically cold disk with rotation-to-dispersion ratio$V_\mathrm{max}/\sigma\sim8$. The results suggest a bright DSFG may have anon-merger origin, and its vigorous star formation may be triggered by barand/or rapid gas inflow.

J0107a: A Barred Spiral Dusty Star-forming Galaxy at $z=2.467$