Two-dimensional is a broad concept that is often used to describe fictional two-dimensional worlds or virtual characters and plots in anime, comics, games, and other media. The 2D culture originated from Japan in the early 1980s. It began to develop with animation, comics, and games as the main forms of expression. It gradually integrated novels, music, movies, and other elements to form a unique cultural phenomenon. The characters in the 2D works were usually flat, cute, and fictional, while the plots were often filled with fantasy, adventure, friendship, and other topics. Although the 2D culture had a large number of fans around the world, it also had some controversy and criticism. Some people thought that the 2D works were too obsessed with the virtual world and ignored the importance of the real world, while others thought that the 2D culture provided a unique way of entertainment and spiritual sustenance. Two-dimensional is a cultural phenomenon full of charm and controversy that requires us to think rationally and judge.