The Bank of Korea's monthly consumer sentiment index, measuring household perceptions of current economic conditions and future spending outlook. • Baseline 100: Optimism = Pessimism (neutral) • Above 100: Optimistic — spending expansion expected • Below 100: Pessimistic — spending contraction concerns • Below 80: Extreme pessimism (70.8 during COVID in 2020, 72 in 2008 crisis) Composite of 15 sub-indices including current living conditions, future outlook, and household income expectations. Used as a leading indicator for retail sales and domestic demand, and a key survey data point in BOK rate decisions.