Falling Clouds and Wind Follow

They grew up together, but their identities are very different. Their meeting was purely accidental. An encounter, where is she that I miss day and night? Who is it again? After a dispute in the world, there is always the shadow of a person in my mind. Who is he? When they met again, she couldn't remember who she was. She was heartbroken and worried. If she had known this, why did she do it in the first place? I unexpectedly met her here, but unfortunately, she had completely lost her memory. . . . Who is she, and why does her brother yearn for her? Meeting him, are you happy or unhappy?