Karen Tong Po Yu (October 4, 1971-), nicknamed Tang Ji, is a Hong Kong female singer, actress and TV host. He debuted in 1992, and his representative works include the chorus of "Acacia in the Wind and Rain", "Absolutely a Dream" and "The Sky of Fate" with Zhang Xueyou. In 1996, he won the "Top Ten Chinese Golden Songs Award" with the song "Cold".

Filmography