Fantasy: the System Insists on Making Me the Sixth Child

Single female protagonist + inappropriate person + scheming + revenge + decisive killing PS. The protagonist is very sinister, but he is definitely not brainless! The evil dog system deceived me into this damn world and took away my lifespan. Only by being the sixth child can I live longer. I, Zhao Qian, a seven-foot man, even if I die suddenly and jump from here, I will not be the sixth child. . . . . "You are such a monster genius. Not only do you not show off your power, but you are living in a coma with only six people. Are you sick? "Stupid enemy, no matter how strong they are, they still want the best choice for 6 people."