Police have been increasingly encountering fake residence cards in recent years as more foreigners overstay their visas due to the high demand for workers across the country.
Investigators acted on 748 cases of possession, forgery and other offenses involving residence cards in 2019 alone, according to the National Police Agency.
Crime groups have sought out foreigners through social media to sell fake residence cards workers can use to remain employed even after their visas have expired, according to the police.