NCSoft has lost a first-instance court ruling in its intellectual-property infringement lawsuit against Kakao Games over its mobile title ROM (Remember of Musiverse). The defeat follows an earlier loss against Krafton over the game ArcheAge War, making it two consecutive courtroom setbacks for South Korea's once-dominant games publisher. Together, the rulings are reigniting a debate about IP protection strategies—and the potential misuse of litigation—in the Korean gaming industry.
Two defeats: what went wrong
NCSoft alleged that ROM, a mobile massively multiplayer online role-playing game (MMORPG) developed by WonderPeople and published by Kakao Games, had unlawfully copied the game systems, lore, and user interface of its flagship Lineage franchise. The court dismissed the claim. According to sources familiar with the ruling, the bench concluded that systems and rules commonly employed within a particular game genre do not qualify for copyright protection.
The same legal reasoning was applied in the earlier ArcheAge War case, where the court held that "the rules, mechanics, and fundamental systems of a game constitute ideas, and ideas alone cannot be protected by copyright." Legal experts view the back-to-back losses as evidence that NCSoft's IP protection strategy has encountered a structural ceiling under Korean law.
The idea-expression dichotomy
The central doctrine in game copyright disputes is the idea-expression dichotomy. Copyright law protects the specific creative expression of an idea, not the idea itself. In the MMORPG genre, elements such as character progression systems, combat mechanics, and skill-tree structures have become established genre conventions. Courts have consistently held that no single company can claim ownership over them.
Research from Seoul National University's law school suggests that plaintiffs win fewer than 30% of domestic game copyright cases. The high density of shared conventions within any given genre makes it extremely difficult to demonstrate substantive similarity in court. "Gaming companies file suits hoping to protect their IP, but the scope of protection courts are actually willing to recognise is far narrower than most expect," said one legal practitioner.
Why NCSoft keeps reaching for the courts
NCSoft's litigious turn cannot be separated from its deteriorating business position. The Lineage IP, which once defined South Korea's online gaming market, has seen its dominance erode over the past several years as the mobile MMORPG market became saturated, new-player acquisition slowed, and the company failed to produce a breakthrough new title. Operating profit fell sharply in both 2023 and 2024 relative to prior years, fuelling internal anxiety over market share being chipped away by Lineage-like rivals.
In this context, litigation can serve as a competitive weapon even when it fails in court. Filing a lawsuit raises marketing and legal costs for the defendant, unsettles investors, and signals aggression. Critics within the industry argue that NCSoft's approach amounts to "litigation as market pressure, regardless of the legal merits."
What ROM is, and why the court found it defensible
ROM targets the same audience as Lineage M and Lineage W. It belongs to the so-called "Lineage-like" sub-genre—a cluster of mobile MMORPGs that share particular combat styles, player-versus-player (PvP) systems, and guild-centric community structures. The Korean market already hosts numerous titles in this vein, including Odin: Valhalla Rising, MU Monarch, and Ni No Kuni: Cross Worlds. Given that breadth, the court found it untenable to treat any single element of the genre as the exclusive creative property of one publisher. Kakao Games welcomed the first-instance verdict as "a recognition of ROM's independence and originality." NCSoft is reported to be considering an appeal.
The international picture
IP disputes in gaming are not unique to Korea. In the United States, Epic Games successfully defended Fortnite against multiple imitation claims; PUBG's developer Krafton filed a lawsuit against Epic before eventually withdrawing it. In Japan, Nintendo has taken an aggressive stance against counterfeit Pokémon titles and achieved tangible results—but those cases involved the direct copying of distinctive character designs combined with registered trademarks, a far clearer-cut situation than systemic similarity. Across jurisdictions, the trend is consistent: courts apply far stricter standards to direct copying of visual or audio expression than to similarities in game mechanics or genre conventions. The legal boundary between "a game made in the same style" and "a copied game" is drawn quite broadly.
The genre pioneer's paradox
There is a deep irony at the heart of NCSoft's predicament. The company essentially invented the "Lineage-like" sub-genre and elevated it to an industry standard. But the more widely a genre spreads, the more its constituent elements harden from "expression" into "convention"—and the moment that happens, they fall outside the perimeter of copyright protection.
Industry analysts note that "by popularising the Lineage genre, NCSoft inadvertently cultivated the very conditions that allow competitors to build similar games without meaningful legal risk." The episode illustrates a structural truth: legal protection alone cannot preserve a market position that innovation has ceased to defend.
What comes next
The legal consensus is that an appeal would face an uphill battle—the prevailing judicial logic is unlikely to be reversed. In the longer run, the consecutive defeats should be read as a signal that NCSoft's centre of gravity must shift from courtroom strategy towards the development of genuinely new content.
The implications for the broader industry are significant. As courts repeatedly refuse to extend copyright protection to genre-common elements, newer entrants will rationally price litigation risk as low. That will intensify competition while simultaneously forcing established players to diversify their IP protection toolkit beyond copyright—towards patents, trade secrets, and trade marks.
Ultimately, these rulings amount to more than just a pair of courtroom losses. They are a meaningful marker of where the enforceable boundaries of intellectual-property protection actually lie in the Korean gaming industry—and a reminder that legal moats are poor substitutes for creative ones.