Kansui is a herbaceous plant of the Euphorbiaceae family. The root can be used as medicine. It is cold in nature, bitter in taste and poisonous. This is a perfect metaphor for the protagonist - he can save lives, but he is pregnant with "violent poison" (suffering from immortality) and is doomed to be lonely.
· One-sentence summary: Gansui can save others, but cannot save himself. In the past three hundred years, he personally sent away all his loved ones and became the last "heartbroken man" in the world of mortals.
