Modern girl Su Yingtong suffers a sudden shock from eating crayfish and time-travels into a period novel, becoming a cannon-fodder minor female character. To avoid the tragic ending in the original book, she rushes to the steel factory to find her betrothed, but mistakenly goes to the First Steel Factory and meets the reborn factory director Yu Jingze. Yu Jingze had received a life-saving grace from her in his previous life, and knowing full well she found the wrong person, he still chooses to go along with the mistake and conceal the truth, marrying her. After marriage, the two gradually develop feelings for each other. Time-traveler Bai Miaomiao and educated youth Mao Yuerou successively come to stir up trouble, and numerous clues run undercurrents, until at the National Day gala, the secret of the mismatched engagement is exposed in public, and their relationship faces a huge test.