What unrequited love stories are there?

Mi Yue in A Dust Through the Ages is such an example. Unfortunately, feelings have nothing to do with the length of time together. Although two people get along a lot in the Millennium, in the heart of the apocalypse, there is always only one person in ancient times. As for Mi Yue, in the emotional world of the apocalypse, she is only the best friend at best, that's all.

Introduction:

Secret love: in short, it is a kind of unspoken love or love.

In Chinese, unrequited love is an emotional expression, which can include material unrequited love (a country with a large population and a relatively depressed economy can also be said to be a country with complex social contradictions), satisfying sexual needs (such as human beings or animals), and there are homosexual unrequited love and heterosexual unrequited love here? Secret love between friends, etc.