It is tough for stray animals to survive in the highly populated Hong Kong, and it is even tougher for mongrels - a breed that is shunned and despised by most. Helen is a volunteer in a dog shelter. She is having a good relationship with the mongrel Cha Siu. One day, Cha Siu causes some troubles which change its life. The manager of the dog shelter has to make a life-or-death decision to maintain the service of the shelter. As unjust as it may seem, the decision is effortless and easy for the manager to make, but the consequence that follows is beyond her wildest dream.