SEOUL, April 18 (Reuters) - The following is a summary of major South Korean newspapers on Wednesday, prepared by Reuters in Seoul. Reuters has not checked the stories and does not guarantee their accuracy.

CHOSUN ILBO

- Virginia Tech Korean student community head Lee Seung-woo said Korean students are concerned about the possible backlash after it was reported that the gunman in the Virginia Tech massacre was a South Korean citizen.

- Korean Air Co. Ltd. <003490.KS> and Asiana Airlines <020560.KQ> Inc. have been ranked No. 1 in the world in on-time flights, according to Airbus and Boeing Co.

- GM Group Vice Chairman and Chief Financial Officer Fritz Henderson said GM <GM.N> will invest about 3 trillion won ($3.23 billion) in GM Daewoo Auto & Technology Co. in 2008 to 2009.

DONG-A ILBO

- South Korea's national intelligence service has confirmed reports of unusual activity around North Korea's Yongbyon nuclear facility and is looking into the issue.

JOONANG ILBO

- Macao is contacting several Chinese banks to sell Banco Delta Asia after the dispute over North Korea's frozen funds made conducting business difficult, according to a high-ranking BDA official.

MAEIL BUSINESS NEWSPAPER

- Seoul National University said a preliminary investigation showed that its cloned wolves are authentic.

KOREA ECONOMIC DAILY

- The National Tax Service has imposed a 30 billion won ($32.31 million) tax on a paper company set up by foreign investors, led by CCMP Capital Asia and Affinity Equity Partners, after it received dividends worth 120 billion won from auto parts maker Mando.

- South Korean online game company Nexon Corp. says its overseas sales accounted for over 50 percent of its total sales last year.

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