Let me analyze the source text:
Literary genre: This appears to be a Chinese cultivation/urban fantasy web novel with elements of mystery and possibly revenge.
Language style: The language is relatively straightforward narrative prose with dialogue. It has elements common in Chinese web novels, including inner thoughts, character reactions, and detailed descriptions of movements and expressions.
Tone: The tone is somewhat serious and mysterious, with elements of suspense and intrigue.
Plot keywords: Mysterious figure, revenge plot, illness/disease, midnight treatment, Purgatory Training Camp, past betrayal
Characters:
- 周凡 (Zhou Fan): Male protagonist, seems to have strong cultivation/powers, was sold to a training camp as a child
- 乔应飞 (Qiao Yingfei): Male, seems to be a friend of Zhou Fan, concerned about a sick friend
- 高漫云 (Gao Manyun): Female, appears to be sick with some kind of disease that makes her violent at times
