is there a major different in plot between drama and webtoon? If no I would like to know what chapter should I…
There are a lot of differences between the drama and the webtoon, but the theme (bullying and helping friends) is the same, so if you plan on reading the webtoon, start at chapter 1; Sieun/Grays backstory doesn't start until like 20 or 30 chapters. Season 1 focuses on his backstory; season 2 will be the actual story.
yes his character wolf Keum in the wbetoon is a bully and no.1 fighter/leader of Ganghak high he's a ruthless and violent fighter https://weakhero.fandom.com/wiki/Wolf_Keum
https://weakhero.fandom.com/wiki/Wolf_Keum