Growing up in a harsh environment, Hye-won was able to complete her education thanks to Yuseon Airlines' scholarship program, eventually securing a job at the prestigious corporation. One day, Ha Ji-seok, the company's vice president, tells her it's time to repay the company's kindness. He assigns her to secretly monitor his cousin, Ha Tae-beom, the executive director, and report his every move—turning her into an unwilling corporate spy. However, Tae-beom, fully aware that Hye-won is working for Ji-seok, deliberately keeps her by his side, making a show of tormenting her. But things don't go as planned. What started as a mere job takes an unexpected turn as the two find themselves slowly drawn to each other…