Jiang Ning, a gaming enthusiast, gets transported to ancient times due to a game malfunction and becomes the true daughter of a marquis's household. Forced to take another woman's place in marriage to Gu Changyuan, the heir of the Prince of Zhenbei, who is rumored to be near death, she accidentally kills him on their wedding night. With no other choice, she uses a witch's contract to bring him back to life, triggering a dangerous shared-protection mechanism. When she returns to her parents' home, the biased marquis household and her scheming adopted sister, Jiang Rou, make things difficult for her at every turn. Jiang Ning flips the table and cuts ties with the family. Gu Changyuan keeps threatening to kill her, yet his body instinctively rushes to protect her every time. Forced to share their lives, the two join forces against royal conspiracies and the marquis household's schemes, becoming entangled in court struggles as their feelings for each other gradually blossom.