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Do-wook and Ga-young, who are step-siblings, have grown up like real siblings. Do-wook starts to see her step-sister, who took care of everything as always, as a woman... “Noona can never push me away or leave me.”
For most people, family is important. For Seo Do-wook, it’s everything…especially when it comes to his stepsister, Han Gayoung. After Gayoung’s mother passed away when the two were young, Do-wook made a promise to do everything in his power to keep his noona safe. But when their father marries again to a wicked woman determined to make their lives a living hell, it proves harder than he thought. Attempting to escape, the two move out on their own only to be presented with a new problem. As their once familial love begins to turn into tangible desire, will the two step-siblings be able to resist temptation? Or will they give in to themselves and take their relationship one step too far...?
Hyun-soo, who lost his first love, his private tutor to his father. spends his days being constantly ignored by his tiny aunt who appeared out of nowhere, to the point where he forgets even his heartbreak. "Let's go out with me, Kim Hyun-soo." And then, he gets a sudden confession from his aunt?! Thus begins the secret project between the mismatched young aunt and a rebellious nephew, where nothing seems to fit from one to ten!