Who was the murderer in the first movie of Detective Star?

The pilot film of the third season of "Star Detective" was launched yesterday 12. The first guests are He Jiong, Sa Beining, Bai Jingting, Emma Wu, Ruoyun Zhang and Leo. However, the first issue did not announce who the murderer was, and the answer will be announced in the second issue.

He Jiong's He Comics, Leo's Wu Jipao, Bai Jingting's and so on gathered in the Rose Hotel, and they gathered here because they received an invitation letter.

When everyone checked in, everyone was awakened that night. At this time, Bai Jingting first saw a mysterious woman appear at the door of Jiazi's room. He Laoshi and Leo came one after another and immediately entered the room. They found Jiazi seriously injured and tied, with patterns painted on her face.

Who could the murderer be?

I suspect it may be a newcomer Leo ~ because judging from Leo's behavior, it seems to be hiding something. There are also doubts about He Laoshi, because the trailer says, "Don't you find that he is different today from yesterday?" He Laoshi has been emphasizing his cold-blooded design from the beginning of the film.