Taking the battle royale concept literally, PUBG Corp. has filed a copyright infringement lawsuit against Fortnite’s developers, Epic Games, according to a report by the Korea Times.

According to a PUBG Corp. official, the copyright infringement injunction was filed in January with the Seoul Central District Court against Epic Games Korea in order to “protect their copyright.” Despite the case having been filed a way back, no further details regarding the court’s proceedings have been made public.

It can be recalled that the controversy snowballed when Epic Games announced back in September 2017 the release of Fortnite for free on PC and consoles. Expressing concern over the backlash, Bluehole Studios was mulling over the next steps to take against Epic Games, with Bluehole’s Chang Han Kim stating way back: “We’ve had an ongoing relationship with Epic Games throughout PUBG’s development as they are the creators of UE4, the engine we licensed for the game. After listening to the growing feedback from our community and reviewing the gameplay for ourselves, we are concerned that Fortnite may be replicating the experience for which PUBG is known.

PUBG has sold more than 40 million copies on Steam and more than 4 million on consoles since its initial release. It has, however, suffered a dip in playerbase since the rise of Fortnite’s popularity.

Epic Games is currently preparing Fortnite’s entry to the Korean market, after its successful deal with Neowiz Games for distribution.