"The Rebirth of the Demonic Monk in the Journey to the West", I recommend it to you. This fantasy novel tells the story of how the main character, the Demonic Monk, grows up. Although it was not mentioned that the Life's Origin Parasite was the Golden Cicada, there was a similar plot: the protagonist was a sickly person from a young age, and after being adopted, he also learned the art of making Gu. I hope you like this fairy's recommendation. Muah ~๐