Legend has it that the beautiful Pandora opened the mysterious magic box out of curiosity. From then on, diseases, disasters and plagues came to the world, but fortunately, Athena, the goddess of wisdom, quietly stuffed "hope" into it! By an unexpected coincidence, the naughty Shin Min-eun opened Pandora's magic box of fate, and the troubles, sorrows, pains and sorrows that came out of the box were all silently borne by her. Who could it be? But when Min En accepts a new relationship, a childhood promise becomes the biggest worry. To close Pandora's Magic Box, a person who loves Min En must give up her heart in exchange. Who will give up Min En sincerely in order to close Min En's Pandora's Magic Box? An interesting and sweet love story between three people unfolds...