There's something wrong with this assassin

He was reborn in an ancient world where swords were full of energy and was adopted by an assassin teacher. Fang Bie was surprised to find that the martial arts in this world were more prosperous than he imagined.
From high-ranking officials and nobles to commoners, all of them practice martial arts.
In order not to become the dregs of medicine that others grab for practice, don't take pains to practice martial arts, point acupuncture points and light gong and organ techniques, palm and sword techniques to practice qi techniques.
To live a new life, do not seek to live a wonderful life, but seek stability and a long life.
Suddenly one day, a young girl in Jinyiwei was ordered to go undercover to him and became his partner...
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