Sister Dearest, Take the Fall (The Butterfly Effect of a Birthmark)

Summary

When the wealthiest man in the city came to the orphanage to find his biological daughter, he was looking for a specific birthmark on the back of the neck.

I calmly pulled my collar high, hiding mine, and timidly pointed at the prettiest girl in the room.

"Sir, are you looking for a birthmark shaped like a plum blossom? Then you're probably looking for her."

She was taken home.

For the first time in two lifetimes, I smiled a genuine smile.

"Sister, without me to take the fall, let's see if you can survive."