Evil Instinct (1996)
Original title: 極度獸性
Evil Instinct is a 1996 Chinese-language mystery movie directed by Barry Chu, with a running time of 1h 35m. It stars Carrie Ng Ka-Lai, Diana Pang Dan and Bowie Lam Bo-Yee.
Penny and Wendy originally are co-workers and best friends until Wendy is promoted. Penny feels that she is getting old and can't compete with Wendy, she leaves Hong Kong, takes snake blood to cleanse herself, and then returns to Hong Kong for revenge.