My sister, whom I raised, has turned evil after faking her death for three years.

[Transformation into a yuri character + slice-of-life + yandere + younger man/older woman + pure love]
(The rating just came out, it will go up later~)
Su Qing, who was seriously ill, took on a job of "raising a child in exchange for her life".
Everything was going well until the end when I "left work early".
And then we met again three years later...
No? Where's my adorable little sister? What happened to her?!
As Jiang Ran approached step by step, Su Qing shrank her shoulders.
"Is it too late for me to regret this...?"
Jiang Ran didn't speak, but simply held her in his arms, gently inhaling her familiar scent, a hint of almost obsessive madness flashing in his eyes.
"What do you think, sister?"