 According to the Cebu-based Kopino Foundation, a charitable organisation started by a local Korean businessman, the largest concentration can be found in Quezon City in Metro Manila.85 to 90% of the mothers work as bar girls or in brothels with foreign clients.As their fathers are not married to their mothers, they are unable to obtain South Korean citizenship, similar to the situation of the 50,000 Amerasians (children of Filipina women and American soldiers) as well the numerous children of Japanese sex tourists.