Weak Hero

Weak Hero (약한영웅, Yaghan-yeong-ung) is a webtoon series authorised by Seopass and illustrated by RAZEN (Kim Jin-Seok). First serialised in mid-2018 on Naver it was then picked up and hosted on LINE Webtoons in September 2019. It updates every Saturday on Naver and every Tuesday and Thursday on LINE.

Plot
Once the bullies target you, it’s game over. The school is run by tyrants whose favorite hobby is tormenting the weakest kids in class. But then Gray arrived. This mysterious new student threatens to dismantle the established order. He may be small in stature, but his calculative and brutal fighting leaves unsuspecting opponents lying on the floor begging for mercy. Now the school's toughest bullies have to scramble to take down this new and unusual hero.

Official

 * Naver (Korean)
 * LINE Webtoon (English translation)
 * LINE Manga (Japanese translation)
 * Dongmanmanhua (Simplified Chinese translation)
 * LINE Webtoon (Traditional Chinese translation)
 * LINE Webtoon (Indonesian translation)
 * LINE Webtoon (Thai translation)
 * LINE Webtoon (French translation)
 * LINE Webtoon (German translation)

Other Sources

 * Weak Hero (TV Tropes)
 * (MAL - Manhwa)