An article from English-language newspaper The Korea Times has revealed that PUBG Corporation has filed a lawsuit in the Seoul Central District Court against Epic Games, the developer of battle royale rival Fortnite. PUBG Corporation, which is a subsidiary of the South Korean company Bluehole, apparently filed the lawsuit back in January.
https://www.notebookcheck.net/PUBG-takes-on-Epic-in-South-Korean-court.305996.0.html