This world is very big. In this very big world, have you ever met such a person?
He makes you laugh and cry. When you meet his smile, you seem to have seen the most beautiful thing in the world. When he turns around and leaves his back, you feel sad in your heart, as if you have lost something.
An Ran met such a person. Without much precaution, he rushed into An Ran's world as a matter of course, but he turned around as a matter of course, and no trace of him could be found in An Ran's world.
He is Gu Nian'an.