 There were only estimated to be 800 mothers of Lai Dai Han who were still alive in 2015.The main cause of the Lai Daihan problem was the mass rape of Vietnamese women by South Korean troops and the desertion of the children during the Vietnam War, as well as some South Korean troops who married Vietnamese women and had children, but were forced to leave after the Fall of Saigon.Most births of Lai Daihan people are due to rape.