Also known as: 罪印
In The Scum Villain'S Self-Saving System, a zuiyin is a cursed Forehead Mark that indicates that somebody has succumbed to darkening or their so called heart demons (心魔). The term translates to criminal seal or mark of sin. It is often depicted as a flame-shaped print and can change in shape and form depending on the possessor's mental state, sometimes expanding throughout their entire body.