Kim Rok Soo suddenly got transmigrated into the novel title 'Birth of a hero' that he read before. He possessed the body of a very pale yet charming and handsome young man named Cale that was actually trash of his family. He has a glib tongue, doesn't like to trouble himself as he wants to live a life of a slacker. He also very wise and strategic in making decisions and has a power from his original world which is the ability that can record things in his mind without missing any single details.