Kim Se-ui Held in Solitary Cell at Seoul Detention Center Amid Kim Soo-hyun Rumor Case

Kim Se-ui, head of the YouTube-based Garo Sero Institute, has been placed in a solitary cell at Seoul Detention Center while facing criminal proceedings tied to alleged false claims about actor Kim Soo-hyun. The solitary placement, reported on June 29, was described by correctional authorities as a detention-management decision rather than a measure granted at Kim’s request. ¹

The case has drawn public attention because it sits at the intersection of online rumor-spreading, celebrity defamation claims, and detention procedures. In coverage of the Kim Soo-hyun Rumor case, the immediate issue is no longer only the content of past YouTube broadcasts, but also how Kim is being managed while in custody.

Kim Se-ui’s Solitary Cell Placement

YTN reported that Kim, who was arrested on allegations including the dissemination of false information related to Kim Soo-hyun, was confirmed to be housed alone at Seoul Detention Center. The Ministry of Justice said the decision followed a review of possible issues that could arise if Kim were placed in a shared cell, and characterized it as a preventive measure by the detention facility. ¹

MBC News also reported the solitary-cell placement, citing the Justice Ministry’s Correctional Bureau. A bureau official said Kim was placed alone “for detention management” by the relevant institution. ² The same report said Kim’s side has argued that he could face threats from people who have filed complaints against him. ²

Newsis reported that Kim, the representative of Garo Sero Institute, was said to have been held in a single-occupancy cell at Seoul Detention Center since early June. The report also said Kim was understood to have claimed that he could face personal safety risks from victims in other defamation cases. ³

The available reports do not state that the solitary placement changes the legal charges against Kim or the status of the prosecution. They describe the measure as a custodial arrangement made inside the detention system while the criminal case proceeds.

Indictment and Alleged YouTube Broadcasts

Kim’s detention follows a prosecution track that moved forward earlier in June. YTN reported that the Seoul Central District Prosecutors’ Office indicted Kim under detention on June 23 on charges including defamation, violations of the Act on Special Cases Concerning the Punishment of Sexual Crimes, and violations of the Stalking Punishment Act. ⁴

Prosecutors allege that from March to December 2025, Kim spread false information about actor Kim Soo-hyun through YouTube broadcasts on 25 occasions. ⁴ That allegation forms the core of the public-facing Kim Soo-hyun Rumor case, although the full evidentiary record and any trial findings remain matters for the legal process.

The reports provided do not include Kim’s full response to the indictment or a court ruling on the merits of the allegations. They establish that prosecutors have brought the case while Kim remains detained, and that the charges include multiple legal categories beyond defamation alone. ⁴

The matter has also involved claims about threats or intimidation around the detention environment. Newsis cited a YouTube broadcast remark by Eun Hyun-jang directed at Kim: “Se-ui, do not think you will be comfortable after going to prison.” ³ The reports do not establish the legal significance of that remark, but they include it as part of the context around Kim’s stated safety concerns.

Detention Review Was Rejected

Before the June 23 indictment, Kim’s side sought judicial review of his detention. Yonhap News Agency reported that Kim’s side filed for a detention review with the Seoul Central District Court on May 31, five days after his arrest. The report explained that a detention review is a procedure in which a court reconsiders the legality and necessity of detention during an investigation, with a hearing scheduled for June 2. ⁵

Dailian reported that the Seoul Central District Court’s Criminal Division 8-1 rejected Kim’s request on June 2, keeping him in custody. The court was quoted as saying there was “no reason for the request.” ⁶ That decision meant Kim remained detained as the investigation continued and before prosecutors later indicted him under detention.

The reported timeline therefore shows three distinct stages: a failed detention review request at the start of June, an indictment under detention on June 23, and confirmation on June 29 that Kim was being housed alone at Seoul Detention Center. Each stage concerns a different part of the case: the legality and necessity of detention, the prosecution’s formal charges, and the correctional management of Kim while he remains in custody.

The confirmed record shows that Kim Se-ui is being held in a solitary cell at Seoul Detention Center as a detention-management measure while facing an indictment connected to alleged false YouTube claims about Kim Soo-hyun. The case remains a legal proceeding, and the available reports establish the custody status, the charges brought by prosecutors, and the rejected detention review without resolving the underlying allegations.

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Cloi Lee

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