Amon stabbed Cho Won using a needle. Cho Won was an Intermediate Mystic Stage cultivator. Despite his higher cultivation, he didn't resist. At this stage, he could only pray that Amon kept his word and released his family.
Cho Won slumped on the floor after receiving the stab. He was not dead. The needle was not laced with a deadly poison. It was laced with the Tranquil Sleep Powder.
The Tranquil Sleep Powder was a drug Amon modified from the Endless Slumber Poison. While the Endless Slumber Poison caused its victim to enter an endless sleep, the Tranquil Sleep Powder was simply a sleeping pill. It gave its users several hours of peaceful and uninterrupted sleep. Amon had thought about marketing this drug as the third recreative drug. He didn't expect to use it in an operation even before the drug hit the market.