In fact, Yu Changran was a girl with excellent academic performance and decent thinking when she was a child.
It's not that she was so bad later on, it's just that everything deviated from the original trajectory.
They met a cat and a black man in high school, and met Risa in college. The four of them were so entangled that they couldn't figure it out.
But I don't know when it started, and suddenly I was the only one left.