Stefanie Sun Yanzi is a Singaporean singer and songwriter. In 2000, she released her debut album, Yan Zi, which won her a Golden Melody Award for Best New Artist. In 2004, she released her eighth studio album, Stefanie, which won her another Golden Melody Award for Best Mandarin Female Singer. Having sold more than 30 million records, she achieved popularity in Greater China and among the Chinese-speaking world.

A Perfect Day is the eighth studio album by Singaporean singer Stefanie Sun. It was released on 7 October 2005, by Warner Music Taiwan. Produced by Jia Minshu, Peter Lee, and Paul Lee, it incorporates a variety of popular music genres such as pop, rock, electronic and lounge music.