Whenever the boys in the class gathered to joke or tease someone, they'd love to say, "You like Qin Shujian," or "Qin Shujian likes you."
As for Qin Shujian, it was unclear whether she genuinely didn't understand or was just pretending to be clueless. But she never got angry in the face of their mockery, and if someone yelled at her because they were upset - no matter if it was her fault or not - she would always apologize first saying, "I'm sorry".
Since he started paying attention to her, the three words he heard her say the most were "I'm sorry".
He didn't think she had done anything wrong, yet she could always nonchalantly utter the words "I'm sorry".