The appointment follows a four-way pitch.
The launch will target Asian food lovers and health-conscious consumers.
The agency's remit is to develop the new product positioning and a creative platform. The campaign will launch across connected TV, out-of-home, digital and experiential channels in January.
The engagement is the latest in a series of account wins for the creative agency, which has picked up work from Bidfood, SUDC and InferSens in recent months.
“This win represents a huge opportunity for Art of the Possible, enabling us to build on our existing expertise in the food and beverage sector," said Kat Patterson, managing director, Art of the Possible.
Youngran Choi, head of global seaweed business, CJ Cheiljedang, added the agency “demonstrated real passion, impressive insight into our business and marketing challenges, and a determination to go above and beyond to deliver impactful creative work.”