Netflix has recently expanded its offerings with the highly-anticipated K-drama, Weak Hero Class 1. Originally released in 2022, this captivating series follows Yeon Si-eun, a dedicated student who strives to remain in the top 1% of his class. However, his academic journey takes a dark turn when he becomes the target of relentless bullies. Armed with his understanding of physics and sharp intellect, Si-eun takes a stand against his aggressors, with the assistance of two loyal classmates.
Weak Hero Class 1 has quickly gained a reputation for its engaging storyline and impressive character development over its two-season run. Beyond its unique premise, the drama excels in portraying coming-of-age themes and features a talented ensemble cast that elevates its narrative. Viewers who dive into this K-drama are likely to find themselves captivated by the remarkable performances of its South Korean stars.
Park Ji-hoon as Yeon Si-eun
Date of Birth: May 29, 1999



- Active Since 2006
Born in Masan, South Korea, Park Ji-hoon began his acting career at an early age with roles in series like Jumong and The King and I. Later, he shifted his focus to K-pop, training as a singer and performing with the group Wanna One. After their disbandment, he successfully ventured into a solo music career. In 2019, Ji-hoon made a triumphant return to acting, featuring in dramas such as Flower Crew: Joseon Marriage Agency and Love Revolution. In Weak Hero Class 1, he shines as the determined protagonist, Yeon Si-eun.
Notable Projects | Character |
---|---|
Produce 101 | Contestant |
Flower Crew: Joseon Marriage Agency | Go Young-soo |
Love Revolution | Gong Joo-young |
At A Distance, Spring Is Green | Yeo Jun |
Love Song for Illusion | Sajo Hyun / Ak-hee |
Choi Hyun-wook as Ahn Su-ho
Date of Birth: January 30, 2002



- Active Since 2019
Hailing from South Korea, Choi Hyun-wook made his acting debut in the web drama Pop Out Boy! in 2020. After a series of smaller roles, he garnered significant attention for his portrayal in the coming-of-age hit Twenty-Five Twenty-One. He further cemented his rising star status with his role as Ahn Su-ho in Weak Hero Class 1, where he embodies the toughest class fighter who initially dismisses school but ultimately steps in to assist Si-eun.
Notable Projects | Character |
---|---|
Pop Out Boy! | Contestant |
Racket Boys | Na Woo-chan |
Twenty-Five Twenty-One | Moon Ji-wong |
Twinkling Watermelon | Ha Yi-chan |
My Dearest Nemesis | Ban Joo-yeon |
Hong Kyung as Oh Beom-seok
Date of Birth: February 14, 1996



- Active Since 2017
Born in South Korea, Hong Kyung began his acting career with a role in the 2017 series Queen of Mystery. After years of minor roles, he gained widespread acclaim with his film debut in Innocence, earning a Baeksang Arts Award as Best New Actor in 2020. He captures audience attention as Oh Beom-seok in Weak Hero Class 1, portraying a shy individual who, inspired by his own history of bullying, decides to support Si-eun.
Notable Projects | Character |
---|---|
Queen of Mystery | Bully |
Innocence | Ahn Jung-soo |
Lovers of the Red Sky | Choi Jung |
Weak Hero Class 1 | Oh Beom-seok |
Revenant | Lee Hong-sae |
Supporting Cast & Characters of Weak Hero Class 1



Lee Yeon as Yeong-i: Known for her role as a murder-accused teenager in the Netflix drama Juvenile Justice, Lee Yeon portrays Yeong-i, a brave and desirable runaway who captures the attention of the boys in the series.
Shin Seung-ho as Jeon Seok-dae: An established actor recognized for roles in A-Teen, Love Alarm, and Alchemy of Souls, Shin Seung-ho plays Jeon Seok-dae, the leader of a delinquent group who becomes entangled with Si-eun and his friends.
Kim Su-gyeom as Jeon Yeong-bin: Though he began his acting career in 2021, Weak Hero Class 1 marked Kim Su-gyeom’s breakout role as a school bully who relentlessly torments Si-eun, escalating his aggression to alarming levels.
Cha Woo-min as Kang Woo-young: A newcomer in the industry, Cha Woo-min has been recognized for his roles in Night Has Come and Study Group. In this series, he plays an MMA fighter holding a grudge against Su-ho.
Na Chul as Kim Gil-soo: The late actor Na Chul made a name for himself with appearances in Vincenzo and Happiness. He portrayed Kim Gil-soo, a gang leader who exploits teenagers through a gambling app in Weak Hero Class 1.
Gong Hyun-joo as Si-eun’s mother: Familiar to audiences from You Are My Destiny and Hotel King, Gong Hyun-joo plays Si-eun’s math teacher mother, who is often preoccupied with her work.
Kim Sung-kyun as Gyu-jin: An experienced actor recognized for roles in Nameless Gangster: Rules of the Time and D.P., he plays Gyu-jin, Si-eun’s father and judo instructor.
Jo Han-chul as Oh Jin-won: With a significant career in projects like Vincenzo and Hometown Cha-Cha-Cha, Jo Han-chul assumes the role of Beom-seok’s harsh assemblyman father.