In 1998, 17-year-old Mo Junjie, a senior high school student, always wore a hearing aid because of his ear disease when he was a child. He thought he was different from others and felt inferior. Until he met Li Ziwei, who didn't care about his ear disease at all and even thought wearing a hearing aid was cool.Only then did he step out of his self-enclosed world and regard Li Ziwei as his best friend.