In a continent where monsters are rampant, demon hunters go around killing monsters for everyone's safety, but they are also vulnerable to attacks by monsters. People who have been attacked by monsters will lose their consciousness and become monsters within half a year. The Demon Hunter organization will lock up all those who are attacked and destroy them after they turn into monsters.
Zhiyou is also a demon hunter. After being attacked by a demon, she escaped the fate of being imprisoned and hoped to return to her hometown before she died. She hired an idle man named Wen Ning, hoping that he would kill her at a critical moment.
Along the way north, the two met lonely souls one after another. Zhiyou gradually realized that she was unwilling to die, and Wen Ning could not kill her. At this moment, Zhiyou discovered more centuries-old secrets about monsters and demon hunters.