Shenyang, Harbin, Yanbian and Changchun. Which city is called "Spring in the North"?

Changchun is named after the word "spring" in its name, and because it is located in the north, the winter is very long, and spring comes late and goes early, so Changchun people hope that spring can be longer. Changchun is also the city with the largest green coverage area in China. There are trees everywhere, and the streets wander in the green sea, and there is a feeling of green spring everywhere, so it is called the northern spring city.