푸르던

"푸르던" (Once Blue/Once Green) occupies a particular space in IU's catalog — introspective without sentimentality, nostalgic without idealization. The title word refers to a blue-green that's faded, the color of something that was once vivid and is now softened by time. The production floats: acoustic guitar beneath an atmospheric haze, light percussion that hesitates more than it drives. IU's vocal takes on a breathier, more contemplative quality, the phrases slightly suspended as though each is being carefully retrieved from memory. The lyric deals in the specific texture of youth — not its happiness exactly, but its particular intensity of feeling, the way everything mattered at a pitch that later life rarely sustains. What makes the song affecting is its refusal to editorialize: IU doesn't tell you whether those years were better or worse, only that they were differently saturated. The color in the title does that work.