It's not bad, but there is very little. It is a beautiful drama with very expressive actors. They express their feelings with their expression rather than their words.
Prosecutor Jang became a vampire through vampire blood transfusion, prosecutor Min's sister became a vampire because she was his first victim, and prosecutor Min because he was another vampire's victim. How did the other vampire become a vampire? By first victim, they mean the first person they directly suck blood from, right? Was prosecutor Jang in the accident or did go to where the accident happened?