Why does Zhang Yu say that Mogao is nothing like you?

Because Mogao was actually the murderer, she used Zhang Yu, and Mogao had a good relationship with Avril Ramona Lavigne, so she couldn't get out of her sister's shadow. She already knows the real killer, so she can be so calm when the truth comes. She never said that her guess was to use Changyu to help her revenge. She deliberately told the truth to Blue Ocean as a witness. That woman is smart, pretending to be mentally ill because she knows she will let her go, so Mogao laughed at her for not being as smart as her when she left. It is possible that she used Zhang Shuai to kill her sister. Besides, Zhang Yu said that she should solve Aji first. Obviously, Aji is not dead. It should be done by Mogao, so that he can save them in the future and play the role that they are innocent. If Aji belonged to Zhang Yuzang, he wouldn't have been ignorant at that time, and he was going to look for Mogao from the coffin.