In Kostroma, Russia, a series of mysterious letters and patterns have frequently appeared on both humans and animals, sparking a number of unsolved mysteries. A nurse named Lijia encountered a stranger in her home who claimed to be from Dnipro, leaving behind a string of strange letters that no one could decipher. Meanwhile, another resident of Kostroma, Oleg, experienced a similar event, writing down a series of inexplicable letters without any warning. These letters and patterns have not only appeared on humans but also on horses, forming complex designs such as circles, equilateral triangles, stick figures, and spirals. The emergence and changes of these patterns are baffling, and no reasonable explanation has been found to date.