From my point of view, I think the most beautiful thing in the world, it may be not a real thing, but an emotion.
Imagine a story: the main character in the story is a normal people. He might not get a great grade or have high level. Or he doesn't look very handsome, his behavior isn't elegant. He with these, likes a girl lurkingly, which is his deskmate.
And then, in order not to disturb her, he doesn't tell his feelings emotionally. After Gaokao(College Entrance Exam, an very important test in China for students about 18 years old), he takes his bravery and tells his feelings to that girl. I don't sure if he can succeed... But one thing I can certain is that this is a leave-taking to youth, with an end of the emotion, or a continuing and development of the emotion.
In any case, I know this relationship is beautiful and what I yearn for. But I don't think everyone can experience it.
Let me tell you another story: the protagonist of the story developed a timid and fearful mentality when he was a child, and I can't describe it clearly and exactly, maybe it can be called: glass heart. He is such a person, especially when he was a child, he might have been defrauded of money because of his lack of awareness. His heart seems to be more and more closed, maybe his appearance is sunny, and his heart may be caught in self-contradiction.
In junior high school, the boy falls in love with a girl for some reason. It is not the same table, nor is it primary school classmates, it may just be love at first sight. It is said that many people like this girl, and this girl has many choices. But the boy doesn't have too much communication with the woman, it is better to say that there was no communication, and they just know a little about each other, and the boy didn't know much about her. Once, the boy tries his best to tell his feelings, and she replies intermittently. Finally, the cruel reality hits the boy's heart. This is the inevitable ending, no need to ask more.
After that, the boy may still think about the girl, and he may also see the process of the first boy liking the girl. What will the second boy with the glass heart think when he sees the bravery of the first boy? Self-contradictory? escape? numbness? confused? I don't know the answer... However, I know that, the second boy may be me...