Fics like 藍色的花，紅色的蘭 {Lan se de hua, hongse de lan}

Before the ill-fated nighthunt that took their lives, Cangse-sanren chose to send a letter imploring and threatening a man who held a life debt to her that if things should go wrong, he would find and take in her child, swearing otherwise that she would haunt him to the end of her days. Lan Qiren was not pleased by the reminder, but for whatever else that anyone has to say, he is an honorable man. If this is what she will accept as a fulfillment of the debt that he owes her, then he will undertake it. A Wei Ying grows up as a part of Gusu Lan AU.

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