Mu Zijun, who suddenly transferred to another school in his senior year of high school due to his parents' arrangements, had no choice but to separate from his girlfriend Tang Jing. The two agreed to apply for the same university during the college entrance examination and continue to be together. In the new school, Mu Zijun met another girl, Yeyue. The three people experienced emotional entanglements all the way from high school to college to entering society.
In the end, what were the reasons for Zijun's decadence, Yeyue's fall, and Tang Jing's departure?