Underlying Index Performance: The price of 390390.KO primarily reflects the performance of its underlying index, which tracks Korean equities. Strong performance in the Korean stock market will generally lead to an increase in the ETF's price.

Supply and Demand: Market forces of supply and demand directly influence the ETF's price. High demand coupled with limited supply will push the price upward, while increased selling pressure and ample supply can drive the price downward.

Currency Exchange Rates: Fluctuations in the Korean Won (KRW) against other currencies, particularly the base currency of investors (e.g., USD), can affect the ETF's price, as the underlying assets are priced in KRW.

Management Fees and Expenses: The ETF's expense ratio, covering management fees and operational costs, is deducted from the ETF's returns, which can indirectly influence its price over time, compared to the index's raw performance.

Economic Conditions in Korea: The overall health of the Korean economy, including GDP growth, inflation, and interest rates, can impact investor sentiment and the performance of Korean equities, thereby influencing the ETF's price.

Global Market Sentiment: Global economic conditions, geopolitical events, and overall investor risk appetite can spill over into the Korean stock market, influencing the demand and price of 390390.KO.

Tracking Error: The difference between the ETF's actual performance and the performance of its underlying index, known as tracking error, can affect the ETF's price relative to the expected returns based on the index.