This study reports the discovery of a magnetically propagating Hund's exciton in the van der Waals antiferromagnet NiPS$_3$. Using ultra-high energy resolution resonant inelastic x-ray scattering (RIXS), the researchers identify that the exciton's energy is primarily determined by Hund's exchange interactions. The dispersion of the Hund's exciton is found to be analogous to that of a double-magnon, indicating that it propagates in a manner similar to a double-magnon excitation. This behavior is attributed to fundamental similarities between the NiPS$_3$ exciton hopping and spin exchange processes. The study reveals that the exciton is predominantly a Hund's exciton, distinct from the Zhang-Rice and other scenarios. The results show that the exciton propagates through the lattice by exchanging spin states, similar to the double-magnon process. The findings highlight the unique magnetic characteristics of this quasiparticle and suggest that it may have potential for controlling magnetic information transport. The study also demonstrates that the exciton is an intrinsic propagating quasiparticle, and its dispersion is consistent with the double-magnon excitation. The research provides new insights into the electronic and magnetic properties of NiPS$_3$ and its potential applications in magnetic information technology.This study reports the discovery of a magnetically propagating Hund's exciton in the van der Waals antiferromagnet NiPS$_3$. Using ultra-high energy resolution resonant inelastic x-ray scattering (RIXS), the researchers identify that the exciton's energy is primarily determined by Hund's exchange interactions. The dispersion of the Hund's exciton is found to be analogous to that of a double-magnon, indicating that it propagates in a manner similar to a double-magnon excitation. This behavior is attributed to fundamental similarities between the NiPS$_3$ exciton hopping and spin exchange processes. The study reveals that the exciton is predominantly a Hund's exciton, distinct from the Zhang-Rice and other scenarios. The results show that the exciton propagates through the lattice by exchanging spin states, similar to the double-magnon process. The findings highlight the unique magnetic characteristics of this quasiparticle and suggest that it may have potential for controlling magnetic information transport. The study also demonstrates that the exciton is an intrinsic propagating quasiparticle, and its dispersion is consistent with the double-magnon excitation. The research provides new insights into the electronic and magnetic properties of NiPS$_3$ and its potential applications in magnetic information technology.