Si Nian is reborn into the body of a cannon fodder character in a novel, retaining her memories of a tragic past life. In her previous existence, she was a wealthy young lady married to Xie Zhi, the illegitimate son of a prominent family, through an arranged union orchestrated by her love interest, Bai Yanlin. Si Nian spent her life obsessively chasing Bai Yanlin, who despised her, while neglecting her husband. Her provocative behavior toward the novel's pure female lead, Lin Yulan, led to her family's ruin and her early death in a car accident. Upon rebirth, Si Nian finds herself at the beginning of the story, where she and Xie Zhi are both guests on a popular dating reality show called "Blazing Heartbeat." A system informs her that she must complete a mission to prevent Xie Zhi from falling in love with Lin Yulan and to stabilize his emotions, or she will be eliminated. Xie Zhi, originally a gloomy and twisted antagonist in the novel, is destined to be imprisoned by Bai Yanlin and later cause the destruction of the entire novel world through his resentment. Si Nian's goal is to win his heart before he becomes obsessed with the female lead.
The show begins with Si Nian and Xie Zhi reuniting as nominal spouses. While the live audience expects Si Nian to cling to Bai Yanlin, she instead directs her attention toward Xie Zhi. Her behavior confuses those around her, including Xie Zhi, who initially believes she is using him to make Bai Yanlin jealous. Si Nian faces numerous challenges, including Xie Zhi's coldness and the system's demanding beginner missions. One such mission forces her to pretend to have a leg cramp, resulting in Xie Zhi carrying her in a princess carry, which sparks intense reactions from the live audience. Despite Si Nian's efforts, Xie Zhi remains distant, viewing her as a woman who only cares about Bai Yanlin. He recalls their one-night stand, which was the result of Bai Yanlin drugging him, and harbors a deep resentment toward Si Nian.
As the show progresses, Si Nian attempts to win Xie Zhi over through various means, including cooking a elaborate seafood porridge for breakfast. Her culinary skills, enhanced by a system reward, impress the other guests and earn Xie Zhi's reluctant appreciation. Meanwhile, Lin Yulan, the novel's female lead, tries to reconnect with Xie Zhi by claiming they were childhood sweethearts, hoping to rekindle a past bond. However, Xie Zhi remains emotionally detached from Lin Yulan, his thoughts increasingly occupied by Si Nian. The tension escalates during a beach volleyball match, where Si Nian falls into the water, prompting Xie Zhi to rescue her. This incident further blurs the lines between their interactions, leaving Xie Zhi confused about his growing feelings. Throughout the show, Si Nian navigates the complex dynamics between the male and female guests, while the live audience watches with bated breath, torn between their initial disdain for Si Nian and their growing fascination with her and Xie Zhi's evolving relationship. The story unfolds against the backdrop of the reality show, with Si Nian determined to change her fate and save the world by winning the heart of the man she once neglected.
