The story of "Waterfall" is inspired by a true story of a friend of director Chung Mong-hong. The design concept is based on the metaphors and constant collisions between the two heroines in the movie "Waterfall". Just like the grass in the poster, it slowly surrounds the mother and daughter, as if protecting them but also as if they are trapped. The blue curtain behind them symbolizes the unfinished and anticipated future, and the blue base is like layers of water curtains, with a large amount of water falling down like a waterfall.