Before smart phones became popular, Ye Jingxiao, who was in junior high school, sat behind Zhang Chennai during the day and behind Zhang Chennai at night. On the weekends, she leaned on a keypad machine and chatted wordlessly. However, she was too shy at the time and hid those words in her heart for three years. Three years later, they sat in college and could chat on their smartphones. They got in touch again because of small things. From then on, the fate of the two people was linked together and could no longer be separated.