The study investigates the properties of the exciton in the van der Waals antiferromagnet NiPS$_3$ using ultra-high energy resolution resonant inelastic x-ray scattering (RIXS). The research reveals that Hund's exchange interactions are primarily responsible for the formation energy of the exciton. The dispersion of the Hund's exciton is measured and found to propagate similarly to a double-magnon, indicating fundamental similarities between the exciton hopping and spin exchange processes in NiPS$_3$. The unique magnetic characteristics of this quasiparticle are highlighted, distinguishing it from other types of excitons such as Frenkel, Wannier, and Hubbard excitons. The study also confirms that the exciton is a Hund's exciton rather than a Zhang-Rice exciton, based on detailed analysis of the exciton wavefunction and its interactions. The findings provide insights into the novel electronic and magnetic properties of NiPS$_3$ and suggest potential applications in controllable magnetic information transport.The study investigates the properties of the exciton in the van der Waals antiferromagnet NiPS$_3$ using ultra-high energy resolution resonant inelastic x-ray scattering (RIXS). The research reveals that Hund's exchange interactions are primarily responsible for the formation energy of the exciton. The dispersion of the Hund's exciton is measured and found to propagate similarly to a double-magnon, indicating fundamental similarities between the exciton hopping and spin exchange processes in NiPS$_3$. The unique magnetic characteristics of this quasiparticle are highlighted, distinguishing it from other types of excitons such as Frenkel, Wannier, and Hubbard excitons. The study also confirms that the exciton is a Hund's exciton rather than a Zhang-Rice exciton, based on detailed analysis of the exciton wavefunction and its interactions. The findings provide insights into the novel electronic and magnetic properties of NiPS$_3$ and suggest potential applications in controllable magnetic information transport.