Zhangyan. According to relevant public information, the original singer of Happy Days is zhangyan./Kloc-0 was born in Huainan City, Anhui Province on July 20th, 976. She graduated from China Conservatory of Music and is a female singer and actress in China. Lyrics excerpt: the sun is shining all over the sky, trees are everywhere, flowers are happy, birds are happy, and flowers and birds sing and dress up for the new century.