The prime minister says floodlights can be installed for workers to work at night.
Human rights NGO says Putrajaya should learn from the Philippines, whose citizens follow a fixed protocol before migrating for labour purposes.
Sofia Ahmad, who joined Umno four years ago and is contesting a post in Puteri Umno, says the party is still relevant and that it can rise from defeat.
Report says these workers are among 5,000 Malaysians lured to South Korea with promises of lucrative salaries.
He says many of them may be aging doctors who had chosen to reside in the UK after completing their specialist training.
The foreign workers will be leaving the country in stages with their employers' assistance, says the Immigration Department.