Shanghai Romance comes from Orange Caramel, the bright subunit of South Korean girl group After School, built around a retro Shanghai cabaret concept with playful styling and choreography. The full music video was distributed through 1theK, helping the song reach international K-pop fans beyond Korea. Short clips like this one have since circulated among fans who collect favourite hooks, dance moments and concept sounds from the era. It remains in use because the melody is instantly recognisable, upbeat and distinct from more recent K-pop production, making it a nostalgic shorthand for the group's charm.