On June 23, 2026, a high-profile legal battle in South Korea reached a turning point when the Seoul Central District Prosecutors' Office indicted Kim Se-ui, the head of the controversial Garosero Research Institute, on charges of defamation, violations of the Sexual Violence Punishment Act, and the Stalking Punishment Act. The case has gripped the nation, not only because of the celebrity names involved but also due to the broader implications for online speech, privacy, and the boundaries of public interest reporting in the digital age.
Kim Se-ui, a well-known YouTuber and social commentator, faces allegations that he spread a series of false and damaging claims about popular actor Kim Soo-hyun and the late actress Kim Sae-ron. According to reports from Yonhap News and iNews24, prosecutors say Kim Se-ui used his platform to allege that Kim Soo-hyun pressured Kim Sae-ron, who was a minor at the time, into a relationship and that Soo-hyun’s supposed financial demands contributed to her tragic death. These claims, authorities stress, have been found to be entirely fabricated.
Between March and December 2025, Kim Se-ui is accused of producing and broadcasting at least 25 YouTube videos that purportedly showed evidence of a six-year relationship between Kim Soo-hyun and Kim Sae-ron, beginning when Sae-ron was just 15 years old. Prosecutors allege that Kim Se-ui manipulated KakaoTalk chat screenshots, doctored audio files using generative artificial intelligence, and broadcast private photographs of Kim Soo-hyun, all to lend credibility to his false narrative. As Kyunghyang Shinmun detailed, these videos were not isolated incidents: over the course of several months, Kim Se-ui also aired five videos showing Kim Soo-hyun in a private setting—wearing only a T-shirt and underwear while doing dishes—and released 34 separate videos that exposed other aspects of the actor’s personal life. These actions, authorities say, violated existing court orders meant to protect Kim Soo-hyun from stalking and harassment.
Kim Se-ui’s conduct went beyond simply airing rumors. According to iNews24, he allegedly threatened to continue revealing private information about Kim Soo-hyun unless the actor publicly admitted to the false relationship and issued an apology. Kim Se-ui even warned that he would escalate his campaign around the release of Kim Soo-hyun’s new drama, raising the stakes for the actor’s reputation and career. Prosecutors say these threats amounted to attempted coercion and intimidation.
The legal process leading up to Kim Se-ui’s indictment was marked by a series of dramatic developments. The Seoul Gangnam Police, after concluding that Kim Se-ui knowingly fabricated and disseminated these damaging stories to attract public attention, applied for an arrest warrant on May 14, 2026. The court granted the warrant on May 26, citing concerns that Kim Se-ui might destroy evidence or attempt to flee. Despite denying all charges, Kim Se-ui was detained, and his subsequent request for a detention review on May 31 was rejected. The prosecution’s investigation included interviews with victims and forensic analysis of the manipulated audio files, which confirmed that Kim Se-ui had arbitrarily edited materials and spread unverified, distorted claims that caused significant harm.
In the aftermath of these revelations, Kim Soo-hyun’s legal team announced that they would pursue what they described as "astronomical" damages against Kim Se-ui. Go Seung-rok, Kim Soo-hyun’s attorney, told YTN Radio, "When Mr. Kim Se-ui returns to society, we must ensure that he cannot repeat such actions by destroying his economic foundation entirely. Even if he enters personal rehabilitation or bankruptcy proceedings, damages arising from unlawful acts like these will not be exempted or reduced." This hardline stance signals a determination to seek full accountability for the harm caused and sets a precedent for future cases involving online defamation and privacy violations.
The case has also sparked a broader debate in South Korea about the responsibilities of online content creators and the dangers of unchecked rumor-mongering on social media platforms. Prosecutors have made it clear that they intend to adopt a zero-tolerance approach toward what they call "malicious content creators"—those who spread fake news or incite public criticism under the guise of public interest or private retribution. In a statement reported by IMBC, the prosecution said, "We will respond strictly and without exception to those who, in the powerful online space, spread false news and encourage public condemnation of individuals under the pretense of public concern or personal justice."
Public reaction to the unfolding saga has been intense and divided. Some observers, especially those concerned about the rise of online harassment and misinformation, have welcomed the authorities’ firm response. They argue that the case highlights the urgent need for stronger safeguards against digital defamation and the exploitation of personal tragedy for clicks and notoriety. Others, however, have expressed concerns about potential overreach and the chilling effect that aggressive prosecutions could have on legitimate whistleblowing and investigative journalism, especially when it comes to exposing wrongdoing by powerful figures.
For Kim Soo-hyun, the ordeal has been deeply personal and public. The actor, known for his roles in major Korean dramas and films, has had his private life dissected and misrepresented for months. The emotional toll was evident during a recent press conference, where he reportedly broke down in tears while discussing the impact of the rumors on his family and career. His legal team’s aggressive stance is, in part, a bid to reclaim his reputation and send a message to others who might consider similar tactics in the future.
As for Kim Se-ui, his case is now set to move through the courts, where he faces a daunting array of charges. While he continues to deny any wrongdoing—insisting that the audio files and other materials were not fabricated—the weight of forensic evidence and the breadth of his alleged campaign against Kim Soo-hyun and the late Kim Sae-ron have left little doubt in the minds of investigators. The prosecution’s decision to include charges of attempted coercion and threats, in addition to defamation and privacy violations, underscores the seriousness with which the authorities are treating the matter.
In the end, this case is about much more than two celebrities and a controversial YouTuber. It’s a test of South Korea’s ability to balance freedom of expression with the right to privacy and protection from defamation in an era when a single viral video can destroy lives overnight. The outcome will likely shape not only the future of digital content regulation in the country but also the standards by which truth, accountability, and personal dignity are judged online.
The story continues to unfold, but for now, the message from prosecutors is unmistakable: the era of impunity for malicious online rumor-mongers may be coming to an end.