Scientific explanation: Scent is not a substance, but a process of interaction between substances.
That is, scent equals air+odor.
The former is molecular-level air, while the latter is the signal generated by the physical change when these molecules act on the sensory system, transmitted to the human brain.
This scientific explanation is also applicable to Ji Xinghe's current state.
These gases, in a diffuse state, will exhibit a reflection-like phenomenon upon encountering obstacles, colliding with each other multiple times, and also colliding with their initial diffusion point.
Before they completely return to nothingness or transform into a state that Ji Xinghe can no longer perceive, much of what they can 'sense' is fed back into Ji Xinghe's sensory system.
If Star Moon can perceive the existence of the air and knows Ji Xinghe's current state, it can create a visible spectrum to explain it in the most intuitive way:
