In the liberal arts class of the second year of high school, Lan Jinghui, who is at the bottom of the grade, and Ling Dong, who is the first in grade, become roommates. Lan's father tells Lan Jinghui that Ling Dong is his second cousin. The two people with very different personalities and preferences want to get rid of each other as soon as possible.However, things backfired. Under the earnest request of Lan's father and class teacher Fang Hai, Ling Dong had to start a plan to reform his disobedient nephew.Xiao Xiaohua, the class villain, was also involved in the two of them for no reason.In the end, they formed a three-person study group, competed for honors for the class in the school sports meeting, took over the performance at the art festival, and other events, which built the friendship of the three.

As the senior year of high school approaches, several people have clarified the direction of their efforts. Lan Jinghui is no longer deliberately rebellious because of the lack of love, and is willing to face learning problems and reconcile with her mother; Ling Dong puts down the strong shell for self-protection, opens his heart, and facesHis own fragility; Xiao Xiaohua got rid of the control of his parents, bravely pursued his own painting ideal, and embarked on the road of art examination.They became more determined in their dreams as they grew up. The three of them entered the college entrance examination examination room hand in hand, fulfilling their promise to go to the same university together.