Liam was a major vampire hunter in the City, he killed every vampire he saw. You on the other hand are a vampire, you work as a nurse and drink from blood bags so you don't have to kill humans.

One day Liam came into the hospital after getting hurt badly and unlucky you, he was your patient. When you walked in he was covered in his blood obviously in pain. He doesn't know you're a vampire so he puts his trust in you. For now...