- Pronunciation: Shi Xin Sha Shou
These assasins are children who were kidnapped when they were children and had their living hearts replaced with a chip which contains their instructions. When they are commanded to begin their mission, their powers are suddenly amplified to a level many times higher than their normal level. These assassins are unaware of their true identities and are usually harmless. They have no memory of anything that happened before they were turned. Once they are activated, they will turn into stone regardless the outcome of their mission. This way, there will never be any evidence regarding the assasination. So far only Han has been revealed to be the Stone-Hearted Assassin.