"Every drop of blood leading to eternal life has its traceability and shackles."
In the process of defecting from the vampire clan, the vampire Xi'an accidentally killed Innocent, a human friend who had been helping him. With the help of a priest, he washed away his own vampire blood and replaced it with his friend's blood to become an immortal human. In order to atone for his sins to his friends, Xi An voluntarily confine himself to the confessional of a church in a remote mountainous area and listen to the suffering of the world. One day, Xi'an's vampire "father" Amaran found him and told him that this was a conspiracy by mortals to gain eternal life, and Xi'an must recover every drop of blood he had washed away from those who deceived him...
Concept: Man's pursuit of eternal life and its dark side