When doing solid geometry questions, if she wanted to add auxiliary lines, Su Li would definitely add points in the order of ABCD, but after copying Qi Xing's homework 800 times, she chose to add point H directly.
But just adding H points is not enough. Maybe M points, N points are also needed...
But how far does she still have to go from Bad Ending to Happy Ending?
Concept: A girl's youth story