(Gender-bending, 1v1, main character is a shou, real and fake heiresses, mutual pining)
After dying suddenly in an accident, a young man transmigrates to a future era and is reborn as Lan Ling, a will-o'-the-wisp girl raised in the slums.
The good news: Lan Ling is actually the heiress to a great family.
The bad news: She was switched at birth, and the fake heiress took her place.
In this dangerous world, no one knows whether an accident or tomorrow will come first. Then one day, the down-and-out real heiress accidentally crosses the rebellious fake heiress.
After the truth comes out, the fake heiress's life seems to hit rock bottom, and she disappears from everyone's sight.
Late at night, Lan Ling returns to her familiar little home and ties on her apron as usual, preparing a midnight snack for her longtime dearest friend and archrival.
As she busies herself, a soft, warm body presses against her from behind and wraps around her waist. A quiet whisper follows, full of reproach.
"A-Ling, thanks to you, I have nowhere left to go."
"Have you thought about how you're going to make it up to me?"
(PS: Cover removed at the creator's request. Shared-universe setting.)