Cai Yiren first appeared on the day of her tenth birthday. Her father was an entrepreneur just starting out, and his company was yet small. Cai Yiren's mother was hired at that time to work for her father's company. She was a single mother who came from a remote mountainous region and had been deceived by her boyfriend while she was working at the age of eighteen. Alone, she gave birth to Cai Yiren. She was gentle and hardworking, and given her underprivileged circumstances, Cai Yiren's grandmother felt pity for her and often provided financial assistance.
After Cai Yiren's mother had worked for a few years, she brought Cai Yiren from their rural hometown to live with them and transferred her to the same school as Lu Weixi.
