• The Netflix series deviates significantly from the original webtoon in terms of character development and storyline. While the webtoon focused on the gradual transformation of the protagonist, Cha Hyun-soo, into a monster, the series takes a more abrupt approach, with the characters' transformations happening more quickly.

• The Netflix series introduces new characters and storylines that were not present in the webtoon, such as the inclusion of a military unit and the exploration of the government's response to the monster outbreak. These additions provide a broader perspective on the events unfolding in the story.

• The visual representation of the monsters in the Netflix series differs from the webtoon. The series employs more realistic and detailed creature designs, which can be both visually striking and unsettling for viewers, compared to the more stylized and fantastical depictions in the original webtoon.