Lin Yisen discovered that since Lin Mianmian transferred to their class, she seemed to be controlled by someone and couldn't help but cause trouble for Lin Mianmian.
From what others have said, she has become a lot like the vicious female counterpart in campus novels.
The story of childhood sweethearts
The story of "a hot-tempered talkative girl who is disguised as a good girl" and "a practical man who is gentle on the surface but is actually very gentle"
Concept: Everyone is their own universe