Wang Dingyi (played by Wu Chao) runs a small bookstore. His wandering life has made him see the warmth and coldness of human feelings. He is full of loneliness and has long been accustomed to using indifference and sharpness as a tool for self-protection. By chance, a strange mute girl named Xixia (played by Zheng Yawen) appeared in Wang Dingyi's dull and boring life. The only thing that can prove the relationship between her and Wang Dingyi is a note in Xixia's hand. In this way, the fate of Xixia and Wang Dingyi is entangled in one. Although Wang Dingyi treats this uninvited guest rudely and coldly, Xixia uses her meticulous care for Wang Dingyi to make gentle resistance. As time goes by, Xixia's tenacity softens Wang Dingyi's heart, and a wonderful relationship begins. However, just when Wang Dingyi becomes more and more dependent on Xixia, Xixia disappears. Wang Dingyi, who can't let go of Xixia anyway, begins a long wait.