Yoon Hyewon, an agent tasked with espionage amidst the power struggles within Yuseon Airlines. Having grown up in a disadvantaged environment, Hyewon defies the odds to graduate and secure a position at a prominent corporation, all thanks to Yuseon Airlines’ scholarship program. Yuseon Airlines' vice president, Ha Jiseok, tells Hyewon that it is time to repay the company's favor and sends her as a spy to report on the actions of Jiseok’s cousin, Executive Director Ha Tae Beom. Tae Beom, knowing Hyewon’s connection to Jiseok, keeps her close and makes a show of tormenting her. What starts as a professional mission soon evolves into something far more personal as the two grow closer over time.