Su Wanxing, majoring in Chinese language and literature, is at a crossroads in her senior year - on one side there are mountains of course papers and pressure to secure graduate studies, and on the other side she has submitted dozens of internship resumes that have come to nothing. She was worried about the future late at night in the library, was criticized for her "student thinking" in her internship unit, and was at a loss when she first entered the workplace because of complex interpersonal relationships. Fortunately, her best friend Lin Xi always accompanies her to eat at roadside stalls, stay up all night, and listen to her talk about all her confusions; she also has senior Lu Shiyan, who gently accompanies her through the "first lesson of adulthood" from a few words of advice at campus briefings to patient guidance in the workplace. From the ivory tower to the cubicle, Su Wanxing kept trying and making mistakes amid the pressure of studies, the frustration of internship, and the social gap. Finally, she lost her youthfulness, found a career direction, and gained a sweet love that went both ways, turning the sourness of her growth into a warm foundation for her future life.