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Na-yeong and Jeong-woo starts their honeymoon. Both of them are excitemed to live together. Then Min-joo, a housewarming guest, comes to visit. Min-joo, Na-yeong's younger sister, starts to seduce Jeong-woo, who showed a crush on her when Na-yeong fell asleep drunk after drinking together. Jeong-woo accepts Min-joo without even thinking about it, and continues his close love without Na-yeong knowing it.