Also called Blissful Heart-Scratching Powder. A colorless, odorless powder that was one of Sang Wanwan's favorite interrogation tools from her previous life as an elite agent. A mere trace can seep into the body and penetrate straight to the bone. When it touches skin, it causes unbearable itching from inside the skeleton, organs, and every hidden corner of the body, driving the victim to madness. It was carried in a packet concealed between Sang Wanwan's fingers and released by a subtle flick.
