South Korean internet service provider SK Broadband has filed a lawsuit against Netflix to pay for costs from increased network traffic and maintenance work because of an increase of viewers to the US firm’s content, an SK spokesperson said.

The move comes after a Seoul court said Netflix should “reasonably” give something in return to the internet service provider for network usage, and multiple South Korean lawmakers have spoken out against content providers who do not pay for network usage despite generating explosive traffic.

Netflix said it will assess SK Broadband’s claim and seek dialogue and explore ways in the meantime to work with SK Broadband to guarantee customers are not affected.

The popularity of the hit series Squid Game and other offerings have underscored Netflix’s status as the country’s second-largest data traffic generator after Google’s YouTube, but the two are the only ones to not pay network usage fees, which other content providers such as Amazon, Apple and Facebook are paying, SK said on Friday.

Netflix’s data traffic handled by SK climbed 24 times from May 2018 to 1.2 trillion bits of data processed per second as of September, SK said, riding on the success of several Netflix productions from Korea including Squid Game and D.P.

SK Broadband said it sued Netflix for it to pay for using SK’s networks since Netflix began using SK’s dedicated line starting in 2018 to deliver increasingly larger amounts of data-heavy, high-definition video content to viewers in Korea from servers in Japan and Hong Kong.

Last year, Netflix had brought its own lawsuit on whether it had any obligation to pay SK for network usage, arguing Netflix’s duty ends with creating content and leaving it accessible. It said SK’s expenses were incurred while fulfilling its contractual obligations to internet users, and delivery in the internet world is “free of charge as a principle”, according to court documents.