Butterflies love beautiful flowers, but they go with spring. What do the lyrics mean?

Butterflies like beautiful flowers, but with the departure of spring, the lyrics express a sad feeling. Butterflies fall in love with flowers, but flowers will wither with the departure of spring and then come back. This lyric implies the pain and helplessness of love, because the object of love cannot exist for a long time and will always leave or disappear. The theme song "Always Quiet" comes from Xiao Renfeng's "The Legend of the Sword and the Chivalrous Man".