Statistics Korea's consumer price report showed inflation back in the 3 percent range after two months, reversing a run of readings in the 2 percent range.

The direction differed by category. Farm, livestock and fisheries items, which had been driving prices up, slowed. Petroleum products, reflecting the rebound in international crude, and personal services widened the increase instead.

The easing in fresh food prices is attributed to a normalisation of summer supply. Vegetables and fruit, whose shipments had fallen because of heat and rain, recovered supply and their price gains narrowed.

Energy is the problem. Oil prices are set by external factors and are hard to manage with domestic policy. Because crude feeds into transport costs and processed food prices with a lag, it also makes inflation sticky on the way down.

The return above 3 percent is also a burden for monetary policy. The further prices sit from target, the less room there is to cut rates, and this is cited as one reason bond yields rose over the same period.

For Sinophone households in Korea, the felt effect is in groceries and eating out. Imported Chinese food ingredients in particular carry both exchange rate and logistics costs, so the perceived rise can exceed the headline figure.

Inflation statistics are an average. What households feel depends on their spending mix: a household with high rent, one with heavy tuition costs, and one sending large remittances each experience price changes differently.

Next month's reading is expected to hinge largely on oil. What is established now is two facts, the return above 3 percent and the slowdown in fresh food, with any trend judgement waiting on one more release.