The game is called The Extraordinary Majority, and in it you try to solve a puzzle called "The Rooftop Mystery." The following is the game guide for this level, I hope it will be helpful to you.
1. Cause of death: severe head injury
The burns and strangulation marks on the hands were the marks left by Cuihua and Qian Tiaomei's torture of Da Meili. The blunt force wound on the head was the fatal injury.
2. Motive: indecent photos
Cuihua saw the indecent photos taken when she was humiliated in the beautiful girl's mobile phone and killed her in anger.
3. Weapon: baseball bat
The blunt force wound on Big Pretty's head was consistent with the shape of a baseball, and part of the missing nail polish remained on the handle of the bat.
4. Murderer: Cuihua
At first, he just wanted to teach Da Meili a lesson, but when he saw the indecent photos of himself on Da Meili's phone, he became furious and killed her.