Who knows the ending of the serial murder in 12 constellation? Who is the murderer?

The ending is of course the truth. The murderer is Xia Yan. Of course, she is not planning a serial murder in 12 constellation, because there are only seven people he wants to kill, not including Shen Hai and Mei Yu Wei, and there are two women brought by her boyfriend, and they are not the targets she planned to kill, that is, Lu Yao and Vivi. However, these two men were also killed, and the murderer was in. Of course, Yu was later poisoned. As a result, Xia Yan was arrested and later jumped off a building. Shen Hai and Miao Chi survived. Miao Chi pretended to be crazy and escaped being killed.