Kwon Eun-seong as Ja-in: The Adorable Kid Who Steals Every Scene in The Great Flood

Little Kwon Eun-seong as Ja-in in The Great Flood (Netflix, December 19, 2025) is just pure heart-melter. The kid’s only about 8 or 9, but he carries so much emotional weight as Anna’s son trapped in the flood—and later the bigger reveals—that it’s impossible not to get attached. He’s the reason the whole story feels so personal and urgent.

From the opening, Ja-in’s this sweet, curious boy—waking Mom for breakfast, excited about swimming lessons, drawing pictures. Kwon makes him feel real: wide-eyed wonder turning to fear as water rises, clinging to Anna without whining too much. Those piggyback rides through chaos? Adorable and terrifying.

The twists around Ja-in (no spoilers) hit extra hard because Kwon’s so innocent on screen. His reactions—confusion, trust in Mom—make the sci-fi elements land emotionally. In loops, his awareness grows heartbreakingly; Kwon sells the quiet sadness beautifully for a child actor.

He’s been in stuff like Pachinko, but this feels like breakout—chemistry with Kim Da-mi is perfect maternal bond. Scenes with orange juice or goggles? Pure kid magic.

Kwon steals scenes without trying—the film’s heart because of him. Makes the stakes feel huge.