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When MinHo's parents leave for a trip, his sister, Mina, who's been kept from public knowledge, comes to stay at the dorm with him for awhile. His sister is his everything and he's very protective of her. When MinHo steps over the boundaries, he pushes her into the arms of someone else. That someone else is one of the people closest to him. Will the weight of their secret relationship make them crack? Will MinHo find out? What will he do if he does?