A down-and-out young man unexpectedly activates a feeding rebate system, where a single red sausage can yield high cash back. On the train, he encounters a fleeing foreign woman, treats her to a meal and arranges a sleeper berth, continuously feeding her to trigger system rebates. Along the way, they run into troublemaking thugs, and the woman displays fierce combat skills to protect the young man. As the train arrives at the border and inspectors come knocking, the young man discovers that the woman has no identification documents whatsoever, and the crisis of smuggling suddenly descends upon him. He must figure out a way to resolve the predicament before him.