The 24-hour veterinary clinic acts like a bridge, witness their birth, separation, sickness and death that human ever loved. On the other hand, it is filled with hope and despair since their fate depends on our selfishness and ruthlessness. In 2018 October, Macau Yat Yuen Canidrome Club had closed because of its unsatisfied living conditions for greyhound dogs. The fate of over 600 animals was suddenly unclear and became a huge topical. The community started a Greyhound dog’s adoption campaign immediately. As a veterinary doctor, he decided to do this best to help in shorten the adoption process in providing free of charge dental cleaning and physical examinations services. Since then, unreasonable netizens was slandering and attacking the clinic through social media. There is no measurement of value for once’s life, even animals. But treatment could be opposite. In the clinic, life is always valuable. While only human could subjectively judge who is more important! “Once They Were Here” tells the fate of different animals on the choice of human. Perhaps it is not pure love and random. The so-called equality of life is only reflected between those uninterrupted heartbeat., The 24-hour veterinary clinic acts like a bridge, witness their birth, separation, sickness and death that human ever loved. On the other hand, it is filled with hope and despair since their fate depends on our selfishness and ruthlessness. In 2018 October, Macau Yat Yuen Canidrome Club had closed because of its unsatisfied living conditions for greyhound dogs. The fate of over 600 animals was suddenly unclear and became a huge topical. The community started a Greyhound dog’s adoption campaign immediately. As a veterinary doctor, he decided to do this best to help in shorten the adoption process in providing free of charge dental cleaning and physical examinations services. Since then, unreasonable netizens was slandering and attacking the clinic through social media. There is no measurement of value for once’s life, even animals. But treatment could be opposite. In the clinic, life is always valuable. While only human could subjectively judge who is more important! “Once They Were Here” tells the fate of different animals on the choice of human. Perhaps it is not pure love and random. The so-called equality of life is only reflected between those uninterrupted heartbeat.