The male protagonist's name is fourteen times, and the female protagonist has collected fourteen pieces of music. The last one is: The Secret That Cannot Be Told, at the first minute and eight seconds, "You said that letting go of love gradually will go further."
The female protagonist has an answer sheet written by the male protagonist. She has been keeping it, and the fourteen lyrics on it have become her unspeakable secret.
Intention: I have been secretly in love with One Direction for many years