An action growth drama about Yun Shi Eun, a model student with grades belonging in the school's top 1%. He looks weak but he fights against numerous violence inside and outside of the school. It depicts a naturally weak boy in terms of appearance, overpowering a jungle-like school by using his brain, analytical power, and tools.
Jeon Yeong-bin picks a fight with Yeon Si-eun only to be stopped by Ahn Su-ho. Then, he decides to use Oh Beom-seok to attack Si-eun.
Si-eun doesn't back down and reveals the truth about Yeong-bin, but Yeong-bin seeks revenge.
Kim Gil-su learns that Jeon Seok-dae and his gang were thrashed by a nerdy-looking kid, and gets furious.
Si-eun discovers Su-ho's blood on the floor and that the house has been emptied out. He calls Yeong-i for help.
Beom-seok runs into bullies from his old school, and Su-ho makes them apologize to Beom-seok.
Su-ho and Beom-seok's friendship shatters. Si-eun tries to help, but Beom-seok's growing insecurity leads to a dark plan.
Beom-seok's plan unintentionally puts Si-eun in trouble. Si-eun chooses silence over conflict, but Su-ho senses something is wrong.
Having crossed a point of no return, Beom-seok regrets his actions but it's too late. When Si-eun discovers the truth, he takes decisive action.
Still affected by what happened to Su-ho, Si-eun withdraws from others. Seo Jun-tae contemplates taking a stand against the bullies — despite the risks.
After being saved by Si-eun, Jun-tae attempts to befriend him — but both are soon dragged into Choi Hyo-man's revenge plot involving Go Hyun-tak.
While doing volunteer work as punishment for fighting, Si-eun begins to form a bond with new friends — but trouble continues to find him.
Complete episode guide for Weak Hero: Class 1 with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in United States.
This episode guide is organized by seasons, making it easy to track your viewing progress or find specific episodes. Use the episode information to plan your binge-watching sessions or catch up on missed episodes.
After Geum Seong-je crosses the line, Si-eun strikes a deal with Na Baek-jin — leaving Park Hu-min, Hyun-tak and Jun-tae alone in the violent crosshairs.
Worried for his father and backed into a corner, Hu-min confronts Baek-jin. Si-eun considers studying abroad after clashing with his distressed mother.
Si-eun, Jun-tae, and Hyun-tak seek out Hu-min, who has decided to work with Baek-jin to keep the peace. Still, Hu-min finds it difficult to comply.
As Si-eun's absence leaves a gap, Baek-jin presses on with his violent mission. In response, Hu-min rallies his school and challenges him to a showdown.
Hu-min, Hyun-tak and Eunjang students gather to engage in a final confrontation against Baek-jin's gang. In the end, who will prevail?