'Yin Yang Road Eighteen: Possessed by a Ghost') is a 2003 comedy horror film produced by Nam Yin and directed by Jameson Lam.
One day, he sees a restless soul, Mrs Chung, who is looking for a human replacement.
Kong provokes Chung because he spoils her plan when he saves Ying-ying, and she keeps haunting him.
Kong goes to find Mrs Bud Lung to help him, and she tells him that he had disrupted the balance of Yin and Yang when he saved Ying-ying's life.
Mrs Chung had drowned during her pregnancy and she needs to find a human body for her unborn son to possess and be reborn.