On the eve of her engagement, Serena of the Ashford family discovers her fiancé, Lucian, having an affair with her stepsister, Delphine. At the wedding ceremony, she exposes their scheme by revealing a recording of them plotting to call off the marriage. Completely disillusioned with her own family, Serena tosses her bridal bouquet—which is caught by Alaric, the heir to the Blackwood conglomerate, who happens to be disguised as a server. On the spur of the moment, the two decide to get married. Alaric’s grandmother, Ottoline, is unimpressed by Serena’s modest background and sets a challenge: Alaric must conceal his true identity, and Serena must enter the conglomerate as a member of the cleaning staff. Only by passing this test can she be accepted as the mistress of the Blackwood family. Once inside, Serena faces harassment and exclusion from colleagues Berta and Lena; to make matters worse, the family crest ring gifted to her by Alaric is used as "evidence" to frame her for theft. Seraphina, a childhood acquaintance of Alaric, refuses to accept losing him and begins targeting Serena. Meanwhile, the defeated Delphine and Lucian, consumed by resentment, stir up further trouble—spreading anonymous rumors online to smear Serena’s reputation and luring her into a meeting under the guise of nostalgia, only to attempt coercion. The group forms an alliance, plotting to kidnap Serena and force her to renounce her new status. Thanks to the evidence and security measures arranged by Alaric and his associate Cyrus, the entire conspiracy is dismantled. Seraphina, Delphine, and Lucian are brought to justice for their malicious actions. Having weathered numerous storms, Serena successfully manages a high-profile charity gala, ultimately passing all the family’s trials. After enduring so much turmoil, she discovers she is pregnant; leaving the pain of her past behind, she and Alaric embark on a life of happiness together.