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Nan has lived with his grandfather since he was a child. He had a sister when he was young, and they spent more than ten years peacefully. Nan had already been in love with her sister, but unfortunately, one day, his sister was in danger in the mountains. At this time, grandpa seemed to sense that something big was about to happen, and erased the memories of Nan and his sister. He thought that the two would never meet again, but in any case, he was not sure of the secret. After the two met, the whole world almost turned upside down...