Hell

Late at night, in a violent shaking like a great earthquake, "Future dream" building sank 150 meters under the ground with only 23 survivors. Seven days and nights later, legendary detective Ye Xiao led a rescue team down the earth, only rescued 6 survivors and found a large number of murder traces.

The six survivors were all secretive about things happened under earth, truth mingled with a plenty of lies.

Why did they lie?

What murders actually happened under earth?

What were the secrets behind murder?