Like a stubbornly recurring infection, Thailand once again finds its body politic plagued by South Korean illegal online gambling operators.

On Wednesday, Thai media reported that Crime Suppression Division officers had arrested four South Korean nationals suspected of operating illegal online gambling sites from a rented house in Bangkok.

The four suspects reportedly admitted running four websites that catered to over 10k clients, most of whom were based back home in South Korea. The operation, which began shortly after the felonious foursome began renting the house in November 2016, reportedly earned profits of around KRW 30m (US $26,500) per month.

This week’s action followed the arrest earlier this month of five different South Korean nationals who were similarly accused of operating an illegal gambling site out of a Bangkok condominium. The site reportedly had around 700 steady clients in South Korea who wagered with the site on a daily basis.