Seaweed Diary began with Gijang kelp, once prized in Korea and now increasingly threatened by rising sea temperatures. The project approached this not only as ecological loss, but as a question tied to food, birth, memory, and the intimate rhythms of human life. Gijang-type kelp was cultivated directly in the sea and followed over time before being translated into visual art, interactive media, and text. At the center of the project was Bicycle Wheel as Housing for the Seaweed, a cultivation structure at Yeonjuk Bridge that invited sustained attention toward a living organism. The work culminated in a popup exhibition in Gijang, with related presentations at the Seoul Design Festival and UN COP29 in Baku. Rather than treating kelp only as a species under threat, the project asked what else disappears when the seaweed dissolves.