I always believe that coincidences and accidents coexist in the world, so I created this story - the female protagonist Cheng Xiyou is a confident, smiling, and goal-oriented college student in the actuarial department of a university in Shanghai. During the winter vacation of her freshman year, she met the male protagonist Ternence (a Canadian) in China by chance. Some accidents caused them to miss it just once. It wasn't until Xiyou was in his junior year that he was selected by the school to be a one-year exchange student at the University of British Columbia because of his excellent grades. The two met again on this charming campus in Canada. It turns out that Ternence is the youngest professor at the University of British Columbia and the professor who Xiyou chose to take the history of mathematics course. Thus, the story of the two of them restarts between coincidence and accident...