At the beginning of the story, he said: "I also have the answer, and I'll copy it for you." What I don't understand is how he knew this. Chen Changyan would give his deskmate money, and his deskmate would give her the math papers to copy.
At the end of the story, "She plucked up the courage to confess to him on his birthday in 2018. She said she didn't like him anymore. Later, she always took a detour just to catch a glimpse of him from his store." She kept the fact that she once liked a boy deep in her heart, fearing that she would be bruised again.
Chen Changyi doesn't look like the heroine in the novel. The heroine in the novel has good grades and will improve through continuous hard work, but unfortunately she is not so lucky in everything.
Intention: Keep getting better. No one can save you, but you can still shine a light for yourself.