Bai Shihan's reason for liking Lin Xinyu was very simple. First, she felt a sense of curiosity about him, feeling that he was completely different from anyone else she had ever met, doing things she would never dare to do herself, and even helping her with many things quite unintentionally.
Lin Xinyu probably didn't remember, but Bai Shihan had kept every single thing in her heart.
Curiosity combined with gratitude, and finally turning into daily contact, naturally fostered corresponding affection over time.
Chapter 178