Zhang Yan. According to relevant public information inquiries, the original singer of the song "Happiness" is Zhang Yan. She was born on July 20, 1976 in Huainan City, Anhui Province. She graduated from the China Conservatory of Music and is a Chinese female singer and actress. Excerpts from the lyrics: The sky is full of sunshine, the ground is full of green shade, the flowers are happy, the birds are also happy, the fragrance of flowers and the chirping of birds decorate the new century.