Ye Linlin transmigrates into the body of a vicious female supporting character in a historical romance novel. The original owner was the younger sister of the male lead, Ye Cheng, and was destined to die a tragic death after being manipulated into jumping off a building. Upon awakening, Ye Linlin finds herself in a compromising situation with Su Chenghuai, a retired soldier and her brother's comrade-in-arms. Two days prior, the original owner, obsessed with Su Chenghuai's appearance, drugged him and attempted to force a relationship. However, due to Su Chenghuai's poor health and the drug's effects, he fainted shortly after they became intimate. Ye Linlin, realizing the gravity of the situation and discovering she is pregnant, decides to take responsibility rather than flee as the original character would have.
The crisis escalates when Bai Ni, the original owner's so-called best friend, arrives with villagers to expose the scandal. Bai Ni had orchestrated the drugging to ruin Ye Linlin's reputation and break off her engagement to Wang Junbao, with whom Bai Ni was secretly involved. Ye Linlin, however, is not the foolish girl from the novel. She quickly composes herself, helps Su Chenghuai recover, and confronts the crowd. She exposes Bai Ni's scheme by revealing that the drug was hidden in a chocolate Bai Ni fed her. Ye Linlin then demands that Bai Ni and Wang Junbao swear they will not be together after the engagement is broken. When Wang Junbao angrily agrees to end the engagement, Ye Linlin counters by producing a detailed ledger of debts Bai Ni owes her, including money borrowed and a valuable watch sold on the black market. Under the witness of the village chief, Qiao Zhengping, Ye Linlin forces Bai Ni to sign an IOU for 293 yuan and officially terminates her engagement to Wang Junbao.
Su Chenghuai, impressed by Ye Linlin's composure and integrity, agrees to marry her to protect her reputation and ensure the child has a legitimate status. The Ye family, initially hesitant due to Su Chenghuai's injured health, eventually accepts the match after Ye Linlin insists on a quick wedding. During this time, Ye Linlin discovers a mysterious spatial dimension accessible through a birthmark on her hand. The space contains a well with healing properties and a garden where plants grow at an accelerated rate. Recognizing this as a significant advantage, she begins experimenting with the space to improve her circumstances and provide for her unborn child.
As wedding preparations proceed, Ye Linlin and Su Chenghuai visit the county department store. There, they encounter Bai Ni and Wang Junbao, who are now openly courting each other. Bai Ni attempts to sabotage Ye Linlin by trying to bump into her, but Su Chenghuai intervenes, pulling Ye Linlin to safety. The encounter highlights the growing bond between Ye Linlin and Su Chenghuai, as well as the continued antagonism from Bai Ni and Wang Junbao. Ye Linlin also begins planning her economic future, intending to use her knowledge from her previous life and the resources in her spatial dimension to build a prosperous life. She purchases a cookbook and newspapers to learn about the era and improve her domestic skills, surprising her family with her sudden competence in cooking. The story sets the stage for Ye Linlin to navigate the challenges of her new life, manage her relationship with Su Chenghuai, and confront the ongoing schemes of her enemies while leveraging her unique spatial abilities.
