She has been in constant trouble since childhood. He has been steady and capable since childhood. An accident closely linked the two people. The sudden departure without leaving a trace of message, and the unexpected reunion set off huge waves in each other's hearts, but their fate would not be so smooth, and there were many twists and turns ahead. They were separated again, and both of them changed after they came back. After several confrontations, they were scarred, and they played this song of sorrow.