Transfer student Zhou Yu'an has a congenital hearing impairment and struggles to fit in with his new class, relying on hearing aids and lip-reading. Ye Chen, the most popular boy in class, is the only one patient enough to communicate with him in sign language. He's also the first person to tell him, "You don't have to hear the world clearly. The world will come and listen to you." On the rooftop, the two of them passed back and forth 321 notes and promised to attend the same university.
But disaster struck without warning. One month before the college entrance exams, Zhou Yu'an's hearing aid was crushed underfoot in the stairwell. In utter silence, he watched Ye Chen's lips and understood the words...
