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Ordinary brothers and sisters won't meet lovers from another world? Because of his father's remarriage, 19-year-old Chen Fan welcomed a gifted sister who was two years younger than him into his daily life. Chen Fan, who had not originally expected this, unexpectedly discovered that the girl had a good personality. When he finally got used to his sister's existence and prepared to live an ordinary life with her, two extraterrestrial visitors disrupted his ordinary life. "Who are you?" "Shouldn't I be the one to ask this..." So, how will they greet this time? Try to return to ordinary life!