Investment funds in South Korea saw their net asset value grow more than 20 trillion won last year as investors scurried to bond funds amid low market rates, data showed Wednesday. According to the data compiled by the Korea Financial Investment Association (KOFIA), net asset value of stock, bond, and real estate-related funds reached a combined 328.4 trillion won (US$308 billion) at the end of December, up 20.8 trillion won from the end of 2012.