  Glycolaldehyde (CH$_{2}$OHCHO) is the simplest monosaccharide sugar in the
interstellar medium, and it is directly involved in the origin of life via the
'RNA world' hypothesis. We present the first detection of glycolaldehyde
(CH$_{2}$OHCHO) towards the hot molecular core G358.93-0.03 MM1 using the
Atacama Large Millimeter/Submillimeter Array (ALMA). The calculated column
density of CH$_{2}$OHCHO towards G358.93-0.03 MM1 is
(1.52$\pm$0.9)$\times$10$^{16}$ cm$^{-2}$ with an excitation temperature of
300$\pm$68.5 K. The derived fractional abundance of CH$_{2}$OHCHO with respect
to H$_{2}$ is (4.90$\pm$2.92)$\times$10$^{-9}$, which is consistent with that
estimated by existing two-phase warm-up chemical models. We discuss the
possible formation pathways of CH$_{2}$OHCHO within the context of hot
molecular cores and hot corinos and find that CH$_{2}$OHCHO is likely formed
via the reactions of radical HCO and radical CH$_{2}$OH on the grain surface of
G358.93-0.03 MM1.
