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Ha-im Yun lives in a world where people register their DNA into cloning databases, a world where human suffering has basically been eradicated. The brilliant mind behind this cloning technology is none other than Ha-im’s boyfriend of five years, Geunhu Ji. Their relationship isn’t perfect, but they make it work -- or so Ha-im thinks, until she finds a dead body at her boyfriend’s house… and the dead body is hers. The next day, she wakes up with no recollection of the previous day until she finds a note from herself in her room… “Ha-im, if you’re reading this, you’re a clone.”
One day, a mysterious classmate named Woo Young-hee suddenly appears out of nowhere. She doesn’t seem quite human... Young-hee is actually a robot who came to school to learn about human emotions. Cheol-soo decides to help her understand them But the more time they spend together, the more Cheol-soo begins to feel something for her—something he can't quite explain in words... A heartwarming tale of a world meant only for the two of them—where no one else can enter!