Please talk about Lu Xun's Snow in a paragraph (about 100 words).

Lu Xun's Snow was written in 1925 1. At that time, on the eve of the Northern Expedition, the two parties formed a United front, and the revolutionary situation showed a gratifying situation. However, Beiping, where Lu Xun lived at that time, was still under the dark rule of the northern warlords, and the reactionary forces were rampant and the struggle was extremely fierce. Lu Xun praised Xue Fei's spirit of pursuing freedom and tenacious struggle by symbolic means, and expressed young writers' strong dissatisfaction with the cold and dark society, as well as their revolutionary feelings of praising beautiful things and resolutely fighting against the dark forces.