"The key is, there's rapeseed oil on the hands, which makes acting inconvenient."
"Especially for this kind of murder, the killer used a dagger, and the handle is made of metal."
"With a metal handle like this, having rapeseed oil on the hands would make it easier to slip, wouldn't it?"
Li Jian listened and nodded gently. "What you say makes a lot of sense."
"According to our regular habits, if there's grease on the hands, it would be washed off first thing."
Wan thought for a moment and patted the steering wheel.
"It's like sometimes after eating chicken feet and duck necks, I always wash my hands right after, there's no way I'd touch anything else with greasy hands."
After hearing this, Li Jian furrowed his brows.
"If we look at it this way, what problem does it indicate?"
"Could it be that the killer just happened to come in contact with rapeseed oil while preparing to commit murder?"
Jiang An nodded.
"Mr. Li, that's actually my thought."
