Bastard follows the life of a teenager called Jim Seon embittered at his own life, his dad, and the world around him. His mental state isn't particularly good, and there is something really dark inside of him that always stirs when he thinks about his father...

The fact that he has a glass eye, artificial valves in his heart and various pins in his bones doesn't help others in seeing him in any more of a positive light, with most of his classmates calling him an emo loser, disabled, among other things. Although bleak, things seem normal enough until a series of kidnappings and murders start to happen around the neighborhood, and that causes things take a sharp turn for the worse...