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Who can keep the promise he made with her when they were young? By chance, she transferred to another school and found out that he was the eldest brother she had agreed with back then, but he had forgotten about it. She tried her best to make him recover, but he was bruised and bruised again and again. She regretted it... Until he recovered his memory later, he regretted it even more. It turned out that he was the one who had gained but not cherished...