College roommates Nianxi and Li Xiaoli accidentally transmigrated into a 1970s novel, one becoming a Chen family daughter tormented by her family, and the other becoming male lead Shen Weidong's childhood sweetheart. Nianxi took back her job, prepared for the college entrance exam, and constantly searched for the way home; while Li Xiaoli indulged in love, gave up the college entrance exam, and used the advantage of knowing the plot well to break up Shen Weidong and Lin Xiaomei. The two drifted apart. After Nianxi was admitted to university, she returned to modern times with the help of an old Daoist priest; Li Xiaoli got her wish to marry, but was trapped in housework and child-rearing, and still had to face her husband's yearning for his old love. Different choices led former roommates toward completely different lives.