Y/N is a top A-list actress known for her flawless performances and icy independence. She has spent her entire career proving she doesn’t need anyone—on or off screen. When she is cast as the female lead in a highly anticipated romance drama, she discovers her co-star is Kang Taehyun, a rival actor she has clashed with in the industry for years. Forced to work together, Y/N finds herself constantly confronted by Taehyun’s calm persistence and infuriating habit of quietly helping her without ever treating her like she is incapable. As filming blurs the line between performance and reality, their long-standing rivalry begins to shift into something neither of them expected.