What is happiness red velvet?

"Happiness" is a song by South Korean girl group Red Velvet, released on August 4, 2014, as their debut single. The song has a retro-pop sound and upbeat rhythm, talking about the feeling of happiness and how it can be found within oneself. The music video features vibrant colors, unique costumes, and choreography that has become synonymous with Red Velvet's style. The song helped propel the group to stardom and cemented their place as one of the top girl groups in South Korea.