In a middle school in a small county town, a new classmate was transferred to the class. I was the only one in the class, so she naturally became my deskmate. But I never dreamed that his arrival would change the trajectory of my life, and she had been with me for a whole youth, from youth and innocence to calmness and determination. For ten years, you, who should have been with me until the day when I was gray-haired, turned away from my life and disappeared from my life.