In 2004, she started her singing career and released her debut Original (album). In early 2005, She participated in the TVB show "Hotel Situation". Her second album "Ellacadabra" was released in late 2005. In mid-2005, Koon starred in the TVB's series "Revolving Doors of Vengeance (酒店風雲)", making her a well-known actress as well. She also starred in "Survivor's Law II" in 2007.