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She has a severe split personality but she doesn't know it. On one side is an innocent and innocent high school student, and on the other side is a cold and dark girl who exudes a dangerous aura. The occasional vague memories were not her own. She couldn't tell who she was, and there was a string in her heart that would break at the slightest touch. He was her little brother who was two years younger than her and had been with her since childhood, but he took care of her confused like an adult more like an adult. He was a famously cold prince in school, but he took off his mask for her dark side. He is the sunny boy in the school. Can the sunshine shine through to her hidden side? Who among the three keys can open the darkness behind it, and who can resist the darkness behind it.