In the evening, if you study at night, it will be popular, if you don't study at night, it won't be popular.
In the middle of the night, there are students living, some people live in prosperity, and no one lives in prosperity.
Middle school students are boys (hexagrams) and girls (hexagrams).
Therefore, the eight characters need soil, and the place where Jin lives is more prosperous. Without soil, the place where gold lives is worse.