First year,
Chen Hao: Can you tell me what love is? Qingqing: No.
The second year,
Chen Hao: Do you understand love? Qingqing: I don't understand.
In the third year,
Chen Hao: Why don't you try it with me? Maybe you can understand? Qingqing: I don't want to.
Chen Hao: Don't you want to try? Still don't want to try it with me? Qingqing: I don't want to try it with you.
This is the story of Chen Hao and Qing Qing. Any similarity in the ending is purely coincidental.