Xu Xiaoye actually had a love affair, which was short-lived and ignorant. It was the happiest and most painful relationship, but it was also the root cause of Xu Xiaoye's inability to love anyone again.
Cheng Ling is the center of this root. Xu Xiaoye has not allowed anyone to mention this person in front of her, because she knows that with the passage of time, some things will leave a deep and lingering mark in her heart like a drop of water wearing through a stone, and it will cause unbearable pain when touched.