The tvN Joy Festival is an offline event in which channel tvN and viewers communicate with each other. The theme of the 2018 festival was '7 days of popping joy' and we created daily characters representing happiness. The faces of the seven characters are made up of the alphabet of each day and they all have happy faces (for example M-O-N for Monday). Using facial expressions, we developed items such as eco-bags, cushions, and phone grips that can be used in everyday life. The event was so successful because the slogan of tvN, Enjoyment, was expressed in the design and delivered to viewers.