The video opens in a bright, vintage-style classroom and school grounds. The members are shown as a close-knit "class of 2005," sharing secrets and passing notes, which captures a sense of youthful nostalgia.
The members act out scenes of distraction and amazement at their own changing feelings. They spend the day together in various colorful locations, from green outdoor spaces to stylized indoor sets, collectively trying to understand the "throbbing" sensation in their hearts that they’ve only ever heard about in stories. csr_pop_pop_official_mv
As they begin to experience the flutters of first love, the world around them becomes increasingly surreal. Ordinary moments are interrupted by playful post-production effects—vibrant green fields, popping candy visuals, and exploding balloons—signifying their hearts "swelling" with emotion. The video opens in a bright, vintage-style classroom