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A man's body, a woman's face.
Yang Jian felt that if he really did that, once Tong Qian came back to life, she might furiously chase him down the entire street,
but he did not want to risk another venture into the hotel to find a still-living female corpse for Tong Qian, let alone commit murder of another innocent woman for her resurrection.
Similarly, he could not allow Zhao Lei to be resurrected as a stranger.
"The only usable body is Zhao Lei's, now that we can't find Zhao Lei's face, he cannot be brought back to life. Tong Qian's face is in my hands, but her body can no longer be used, her body has been taken by a ghost, and I cannot possibly entertain the notion of battling that ghost... This is the only way now, if we delay any longer, the face will decay, the body will die, and then nothing can be salvaged."
Yang Jian, though reluctant to do so, had no choice.
The circumstances did not permit perfection.