The annex room in Song Tiejun's house was full of old bloodstains. During the investigation, Lu Chuan discovered that some stains were very old, some as long as three to five years, or even longer.
It's confirmed that this annex room is the crime scene where Song Tiejun dismembered and disposed of bodies.
Lu Chuan opened the iron stove that Song Tiejun mentioned, which was actually a coal stove used by Song Tiejun for blacksmithing.
The stove looked very old, a relic of times past. Sun Jianguo knew it was something left by Song Tiejun's grandfather, with nearly a century of history.
There were no burning coals inside the stove, but it contained a considerable amount of ashes.
Lu Chuan used a poker to stir the ashes and realized that Song Tiejun was not lying; there were indeed bone ashes inside the stove.
Human bones primarily consist of organic matter, minerals, and water.
