Shen Ningshuang is a top killer in the world. In order to find out the secrets of her employer, she needs to sneak into the mansion of a powerful person, but unexpectedly gets entangled with street performer Gu Qingci. In order to deceive others, the two were forced to pretend to be lovers. She hid her blade and pretended to be weak, and he hid his sharpness and acted ordinary.
This was just a joke, but they became sincere as they got along day and night. But the gap in identity and the fetters of mission make love a weapon that can hurt people - she points her sword at his relatives and friends for the mission, and he exposes her disguise for the truth, and they are all bruised and bruised while falling in love and killing each other.
What's even more fatal is that the junior sister she regarded as her own sister actually stabbed her in the back for profit, pushing the two of them into a desperate situation. When the killer's blade confronts the artist's strings, can they break through the shackles, or will they completely sink into sadomasochism?
