What? My Secret Love Spans Time and Space

[Time travel + urban daily life + love] The figure that appeared in the living room late at night was a familiar girl. He had no contact with her seven years ago. Why did he appear in his home? And... In school uniform. "Lu Nan, we meet again!" "You... You are..." "Let me introduce myself again, twenty-five-year-old Lu Nan, and I am seventeen-year-old Xiaoya." "Seventeen years old?" "Not only that, you will meet more of me in the future." More... Xiaoya? This... What is going on? ! Someone please explain it! ! !