Happy

A shimmering confection of layered synths and crisp percussion, this track bursts open like a party that's already in full swing when you arrive. The production is bright and relentlessly forward-moving, with staccato brass stabs punctuating a bed of buoyant electronic textures that feel lifted rather than heavy. Vocally, the large ensemble works in its favor — voices trade off with an almost chaotic generosity, each member adding a different shade of delight before choruses erupt into full-group euphoria. The song doesn't build so much as it sustains a breathless plateau of cheerfulness. Lyrically, it circles around the simple, almost stubborn insistence that happiness is a choice you make, a posture you hold against the drag of ordinary days. It belongs squarely in the mid-2010s K-pop moment when girl groups were mining pure optimism as aesthetic philosophy, and WJSN leaned into that harder than most. This is the song you'd put on while getting ready for something you've been looking forward to — not to hype yourself up, but because the mood is already there and you want music that matches it exactly.