Song Niannian is a mathematics master in the eyes of others, with clear logic, calmness and self-control, and a life trajectory as regular as a precise formula; Yu Qianze is an art genius in the eyes of teachers, lonely and sensitive, with flowers blooming in his pen, and the world only has canvas and color.
An accident between classes caused two "parallel lines" that had no intersection to suddenly intersect. This is two teenagers crossing time, and their "concern" finally twists the parallel lines into a bond.
Concept: an undefined world