Bullied by the delinquents, Su and Jin-oh, the outcasts of the school, are forced to eat Fuligo septica (yellow slime mold). As a result, their bodies undergo mutations, granting them the traits and powers of Fuligo septica (the Blob). Although they are still ignored or bullied within the school, the two kids, hiding the nature of their powers, slowly begin to take control of the school’s food chain. However, traces of slime start appearing, becoming a social issue, and with the appearance of Kim Soo-hyuk, the creator of the mutated Blob experiment subjects, the conflict grows increasingly intense.