Outside of marriage, there is a kind of relationship called extramarital affair. The heroine of the novel used her life to give a special interpretation of this. I don't know how to define this kind of emotion on the moral scale, but it contains persistence, sincerity, purity, no regrets, and is deep in the bones. Do we only define it as understanding and tolerance? The story begins by describing the sad and lingering extramarital relationship between two men and women.
Purpose: marriage