A female dusky shark — an endangered species, about 3 metres long — has been stuck in a canal in Busan's North Port since 18 September. In the weeks since, she has become a national celebrity called Bukang-i, drawn 1.6 million visitors to a park that usually sees 2,000 on a busy Saturday, and prompted South Korea's president to make a personal visit. Two official rescue attempts have failed. A third is scheduled for Wednesday. But the real story is what happens after dark. A group of YouTubers who call themselves jagyeongdan — roughly translated as a neighbourhood watch — don hi-vis vests each night to patrol the canal's waterfront, livestreaming as they go. Their target: "lantern villains," visitors who shine torches, fishing lamps, and camping lights into the water, startling the shark into thrashing against the concrete walls. Footage from one guardian, Na Tae-soo, captured Bukang-i twisting violently away from a 2am torch beam and striking the canal side. The national fisheries institute later confirmed an abrasion on her snout. Korean media report 105 officials from seven agencies are assigned to the shark's welfare, with a team on standby to reach the water within three minutes. The YouTubers dispute this. After midnight, they say, it is essentially just them. The waterfront is officially closed from midnight to 5am, a restriction the guardians describe as unenforceable across a park of that size. One night, livestreamer Choi Won-jin filmed a man tipping food waste into the water. The tension between official protection and improvised civic action runs through the story. Choi believes the city should let the shark leave on her own terms rather than force another rescue attempt. Kim Jong-hwan, who has livestreamed Bukang-i almost daily, describes watching the nets and water pumps deployed in earlier attempts and finding them "objectionable." Both men frame their position the same way: she came in by choice; she will leave when conditions change. The science supports a plausible exit timeline. Dusky sharks prefer water between 18°C and 26°C. Below 15°C, physiological decline begins; around 11°C, survival becomes precarious. Busan officials expect the canal to reach that temperature after mid-November. Nobody has observed Bukang-i feeding, though experts note that sharks her size eat infrequently and feeding can happen in an instant. Meanwhile, the fisheries institute recorded 46 large sharks off the east coast in the first half of this year — nearly four times last year's count — attributed to warming seas and increased prey availability. The commercial side has been predictable and swift. Commemorative soju, a baseball mascot in a shark cape, an honorary city ambassadorship, and a surge in sales at nearby shops. The story has the architecture of every modern wildlife-celebrity event: genuine ecological concern layered with content creation, civic pride braided with monetization, and official bureaucracy outpaced by volunteer commitment. What makes it worth attention is the guardians themselves — ordinary people who showed up with selfie sticks and stayed because watching an animal in distress changed something in their daily calculus. "She's just an animal," Kim says. "If it gets cold, if there's no food, if the water doesn't suit her, she'll leave by herself. I'd like her to just be left alone, to rest there comfortably until then, and go." It is a remarkably clear ethical position, arrived at not through ideology but through sustained observation — hundreds of hours of watching one animal in one canal, broadcast live to anyone who cares to tune in.