Wen Tingxia, a socially anxious homebody, unexpectedly transmigrates into a novel and becomes bound to a dramatic penguin system. She must play the role of a clingy, love-struck ex-girlfriend and complete a time-limited romance mission lasting one month. Her target is He Xulin, the aloof, abstinent genius who reigns as the campus heartthrob. According to the original story, she is supposed to break up with him when the mission expires, allowing the original heroine to have him. She initially intends to go through the motions and finish the plot just to complete her task. But as they spend more time together and their feelings become increasingly tangled, He Xulin refuses to be bound by the original storyline and gradually falls deeply in love with her for real. While dealing with the system's missions, the difficulties caused by a rival female character, and the turmoil of wealthy families, Wen Tingxia struggles between reason and a growing attraction. Together, they begin to break free from the fate dictated by the original story.