In the two upside-down twin worlds, people live and work independently of each other as if they are living in parallel worlds. The law stipulates that no one can communicate with people in another world, let alone try to cross to another world. Live in the lower world of Adam () and life in the upper world of Eva (meet and alternate good at the top of the world in their lives). Unfortunately, an accident caused Eva to lose her memory and forget Adam.
Although Adam has never forgotten Eva, he can't meet her at the top of the mountain. Until one day many years later, Adam accidentally saw Eva on TV, and instantly awakened the feelings buried in his heart. Adam, who is still obsessed with Eva, is determined to use his scientific talent to break into the ladder, obtain high-tech equipment, break through the limits of space gravity, and talk with Eva about a love that reverses the world. Although their distance is not far away, their love is destined to be far more than just you and me
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