: The song compares the pain of separation and longing to an "internal winter"—a period of cold, isolation, and stagnant grief. This is visualized through snowy imagery and references like the "Snowpiercer" train, which travels through an endless frozen wasteland.

"Spring Day" centers on the central metaphor of seasons to describe the human experience of loss.

The lyrics explore the complexities of missing someone, moving through various stages of emotional response:

: Spring represents renewal, healing, and the eventual reunion with loved ones. The core message is one of endurance: the song reminds listeners that "no darkness, no season can last forever". Themes of Longing and Grief