A 'chuan chuan' shop is a type of Chinese street food shop specializing in a spicy and sour noodle dish. The design of the shop's front, or facade, is crucial for attracting customers. The 'effect drawing' refers to a visual representation of the proposed design, which often includes elements like the shop's name, logo, and architectural style. This type of drawing is commonly used in advertising and architectural design to showcase the proposed look of a building or space.