The tag is to be used if the book has main character(s) who are ill, have chronic health conditions or are generally weak in health and it is a significant aspect of the character(s) and their story.
For one thing, the new boss who had parachuted in as her superior turned out to be Liu Zhaoran, the same old nemesis she had never gotten along with since university.
For another, her body had begun showing strange, unspeakable abnormalities. Then, of all people, Liu Zhaoran offered to help examine her.
What could possibly lie behind such sudden kindness?
