The story begins when country W sends a mission to country S to ease border tensions. Karen is accompanying the mission as the escort captain. At a palace banquet, Karen accidentally bumped into Princess Ella because of her duties. The two met for the first time and were full of tension - Karen felt that Ella was arrogant and vain, while Ella felt that Karen was vulgar and rude and a symbol of the threat of country W. As the mission stayed in country S, the two met frequently on various occasions. Karen was ordered to secretly investigate the military trends of country S, while Ella was ordered by her father to test the true intentions of the mission, and even set a trap to take advantage of Karen. In repeated confrontations and trials, they gradually discovered another side of each other hidden under the surface: Karen's calmness and reliability and occasional tenderness, Ella's wit and courage and involuntary helplessness. The political whirlpool swept the two deeper and deeper. They are both representatives of the enemy country and are unknowingly attracted to each other. In an accident, Ella is in danger, and Karen rescues her regardless of her own safety. The love between the two begins to sprout, but what follows is a more intense inner struggle and external pressure. They used their understanding of each other to restrain each other, and at critical moments they couldn't help but think about each other, and staged scenes of "falling in love and killing each other". The border conflict escalated again and relations between the two countries collapsed. Karen received an order to arrest Ella as a hostage, and Ella must use Karen's feelings for her to buy time for S country. They make painful choices between love and loyalty, and experience the tests of misunderstanding, betrayal, and separation. In the end, can the two put aside their hatred of country and family...
