Im Yoona is a 16 year old girl that has a sister named Jung Jessica, who is 15 years old. They go to the same school that isn't so great. Yoona's life changes when she saves a boy named Yoon Du Joon(16). He lost his memory so he goes to the same school and lives in the same house with her. After a while, they start to have feelings for each other. Apparently, Jessica has feelings for him too. He only has feelings for Yoona but he pities Jessica. But when his memory returns, will he still remember Yoona or will he forget her?

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