She thought that as long as she kept moving forward, without changing direction or stopping, she would eventually be able to catch up with him. But what should she do when he walks towards someone else?
He thought that as long as he kept waiting, the clouds would eventually clear and the moon would shine. But what should he do if she focuses on the front and never wants to see other scenery.
Persistence will make someone fall in love with someone, and someone will hurt someone...