This online expression originated from a folk song named "Clouds in Hometown" in China. There is a sentence in the lyrics: "The Milky Way in Rizhao Jinshan falls, and the birds around the mountain are higher." Later, this lyric was widely circulated on the Internet, and many young people took it as their slogan to pursue success and struggle, saying that they would catch up with the glory of "Rizhao Jinshan".
In short, what does it mean for girls to send sunshine to Jinshan? In fact, it is expressing a positive attitude and belief, telling people to pursue success, work hard and never give up, in order to finally climb the glorious peak of "Rizhao Jinshan". In real life, we should also apply this enterprising attitude to study, work and life, bravely climb the peak, pursue our dreams and meet a better life.