THE BLOOD ROSE [modern kny x female reader]

EDITED#2
"The blood rose" generally symbolizes a love tied to sacrifice, tragedy, or intense devotion, stemming from mythological tales in which the blood of the goddess Venus/Aphrodite is said to have formed the first red roses to bloom. The phrase can also refer to a white rose with a bloodstain, representing death, or a literary or artistic concept symbolizing the duality of life or the dangerous beauty of strong emotions.

You are the younger sister of UZUI TENGEN.
But no one knows what your occupation is.