A Singapore anime event went viral for all the wrong reasons after a teenage cosplayer dressed as Yuji Itadori from Jujutsu Kaisen was arrested following an attack on Amos Yee outside Doujin Market 2026.
The incident happened on May 9 outside Doujin Market, also known as Doujima, at Suntec Singapore Convention and Exhibition Centre. The event was taking place across halls 403 to 405 when police were alerted at around 2:15PM.
According to Singapore Police Force comments reported by local media, an 18-year-old man was arrested for causing public nuisance after a 27-year-old man was assaulted and suffered minor injuries. The 27-year-old was identified as Amos Yee, the former YouTuber who was jailed in the United States in 2021 for grooming and sexually exploiting a minor.
Videos shared online showed a cosplayer in Yuji Itadori’s familiar Jujutsu Kaisen outfit confronting Yee outside the convention area. In the clips, Yee can be seen being punched and kicked while crouched on the ground. After the two separate, the cosplayer appears to return and tackle him from behind before someone nearby steps in.
Yee later posted on X saying he had just been attacked at the anime convention and shared a photo showing a bloodied upper lip. Before the incident, he had also posted that he intended to attend Doujin Market, despite organisers reportedly cancelling his entry.
In Yee’s own version of events, he said he had been banned from entering the event after attendees raised concerns, but remained in the public area outside the ticketed halls.
Police have not publicly named the arrested teenager. However, parts of the anime community online have identified the cosplayer as someone known as John Cosplayer, or “kay9,” who was seen dressed as Yuji during the incident.
For SEA anime fans, this blew up fast because Doujin Market is one of Singapore’s most recognisable ACG events, and plenty of Malaysians travel down for cons like this. Singapore events are usually seen as very organised and safe, so a fight outside a major convention immediately became regional news — not just cosplay drama.
The Jujutsu Kaisen angle also made the whole thing spread beyond Singapore. Fans started comparing the real-life incident to the Shibuya Incident arc, where Yuji confronts Mahito. Meme edits using Yuji’s famous “I am you” line began circulating soon after, turning a serious public altercation into anime internet chaos.
Doujin Market organiser Neo Tokyo Project said it had cancelled the ticket of a “known problematic influencer” and was working to prevent him from attending future events. The organiser also said visitor safety is taken seriously, while making clear that it does not support violence.
That part matters. Even if many fans have strong feelings about Yee’s history, conventions still need to be safe spaces for attendees, cosplayers, artists, and families. Once things turn physical, the whole community gets dragged into the mess — and organisers across Malaysia and SEA will likely be watching this closely when planning future security rules.
Under Singapore law, public nuisance can lead to a fine of up to S$2,000. If the act is found to have likely caused public danger or annoyance, the penalty can include up to three months in jail, a fine of up to S$2,000, or both. Voluntarily causing hurt can carry up to three years in jail and a fine of up to S$5,000.
Source: Dexerto Gaming