Shin Ji-hoon, a timid 14-year-old boy, is suddenly transported to the Murim world while praying at a shrine. Lost in a world ruled by martial arts and cultivation, Ji-hoon dreams of achieving greatness, hoping to become a powerful warrior. However, the harsh reality of Murim is far different from the stories he read. Faced with bloodshed, and the cruel hierarchy of strength, he abandons his naive dreams. To survive, Ji-hoon makes a ruthless choice—he becomes an assassin, hunting cultivators for his own gain. In the shadows of Murim, he carve his own path.