After the Japanese occupation of Shanghai in 1937, the Central Trust Bureau was withdrawn to Hong Kong, and Kung served as executive director and presided over the business.

Subsequently, Kung Ling-kan went to Harvard University to study in the United States, and married Man Shengli's ex-wife on the way to Manila.

In 1948, in the late period of the civil war between the Kuomintang and the Chinese Communist Party, China experienced severe hyperinflation.

[3] As part of the campaign, David Kung and several employees of the Yangtze Development Corporation were arrested on allegations of holding foreign exchange.

After his aunt Soong Mei-ling came to the United States in 1975, she lived in an apartment that Kung bought for her in the Upper East Side of Manhattan.