The viewfinder is a limited perspective. Spring: it is a representative of splendor and fantasy.
Just like Fang Dunyu is the limited beauty possessed by Chen Shu, the four seasons rotate throughout the year, and only 1/4 is spring.
Intention: 1/4 of the spring of that year is enough for a seed to look forward to the whole four seasons and to go through countless cycles of the same seasons.