Because there are quite a few people here with backgrounds, the death of one would be a big problem. The only solution is to kill everyone, keep the secrets hidden, and avoid exposing one's own presence.
Jiang Muchen did not particularly like what Qin Yu had said, "Adding my Chishan Sword, my strength is not weak. Even if Luo Xueyun is a bit stronger than me, I have gained some enlightenment over the past three days, which has significantly improved my strength. He couldn't easily defeat me at first, but after Qin Shaoyu arrived, they reached an agreement to join forces and surround me."
No wonder.
However, Jiang Muchen was willing to disclose that he had benefited from his contemplation and observation, simply to show off his strength, suggesting that he could form an alliance with Qin Yu, hoping she would not kill him now.
Naturally, Qin Yu had no intention of killing him, at least not for the time being.