She was originally a princess of a country, but she was betrayed by the imperial court and forced to flee. In order to reduce the killing rate, she would rather jump off a cliff herself to keep her guards safe. After falling off a cliff, he was rescued by his mother. He was the son of a prince from a neighboring country. He was unruly, wild and indifferent to others. However, he rescued her, who was also indifferent and distant, and became the princess's personal maid. He was always embarrassing her because he was ignorant of the world, but seeing her frustrated but still stubborn face aroused his determination to conquer her until she completely failed. Something gradually grew under his deliberate difficulty and her unwillingness to admit defeat, but the only thing that remained unchanged was their thin and alienated protective film. Until he received an imperial edict to marry a princess from a neighboring country, the person he married was the daughter of the traitor who usurped the throne. Unexpectedly, she was actually her good sister since childhood. From then on, the relationship between the three of them was complicated. Although she and he were still talking to each other coldly, everyone except him could see the entangled feelings. However, the authorities are obsessed with it, and with the intervention of good sisters, what will happen to the feud between family and country, and the entanglement of love, resentment, and hatred?