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Choices and endings
A Whisper of Fall: Jinyiwei uses player choices to shape both individual mission outcomes and the overall story. The developers have stated there are no morally "correct" choices. Different approaches yield different consequences, resources, and narrative branches.
Mission-level choices
Each mission has multiple completion paths and endings. The Deng Yang demo mission had five distinct outcomes. Three confirmed:

Kill Deng Yang after defeating him.
Spare Deng Yang. The Southern Commandery lockdown force arrives and turns hostile. Deng Yang fights alongside the player as an ally.
Face the Southern Commandery without sparing Deng Yang.
Even the approach to reaching the boss (rushing versus exploring, stealth versus combat, which mini-bosses to fight) changes the conditions and available options at the final encounter.
The protagonist's arc
The overarching narrative asks what the protagonist becomes. Three broad endpoints have been described: "a knight-errant who fights for the nation and its people, a bureaucrat content with a corner of peace, or perhaps another path entirely." Accumulated choices across the full game determine the ending.
Heavenly Deduction interaction
The Heavenly Deduction system complicates the choice system. Players can rewind to explore alternate branches, but rewinding costs mental energy (a finite resource) and limits items carried to three. This means the system is not a free "choose and reload", there are real resource costs to exploring alternate timelines. Players must weigh whether to spend mental energy seeing an alternative branch or conserve it for later use.