Su Mingyi (played by Cheng Yuxi) holds her first photography exhibition, reflecting on her youth and thinking of Yan Liyao (played by Shi Boyu). In high school, she was the class monitor, secretly admiring Yan Liyao. Despite his frequent absences, they crossed paths often, with her feelings hidden. Yan Liyao and Cheng Yan (played by Lin Ziheng) were close but had contrasting personalities. After Su Mingyi confessed, Yan Liyao suggested a “trial” relationship. After graduation, they each buried their secrets. Years later, through an old roll of film and a photography exhibition, these long-hidden feelings are finally revealed, offering redemption for all involved.