What is the name of the novel about meeting my sister’s best friend on the bus?

The novel about meeting my sister’s best friend on the bus is called “Pi”.

"Pi" tells the story of four high school students and their parents as they prepare for the college entrance examination. Lin Miaomiao, a lively girl, was accidentally admitted to a key high school. On the semi-militarized high school campus, she broke away from the control of her mother Wang Shengnan and made three friends: school beauty Deng Xiaoqi, top student Qian Sanyi and sports student Jiang Tianhao. Four teenagers living in different family models face changes and even accidents as they grow up, sharing joys and troubles.

Under the pressure of the double countdown to the college entrance examination and divorce, Lin Miaomiao encountered Wang Shengnan's menopause during her adolescence, and conflicts continued to escalate. Qian Sanyi tolerated her parents' marriage in name only but envied Lin Miaomiao's lively family; Jiang Tianhao was suddenly bankrupted by his parents' business, and his "young master" became the "little brother" who delivers food; Deng Xiaoqi's mood hit rock bottom because her mother's secret was exposed ?