Netflix recently added the popular K-drama,Weak Hero Class 1, to its catalog, and the following are the South Korean stars who make up thisaction-packed K-drama. First released in 2022,Weak Hero Class 1centers on a young man named Yeon Si-eun, who is dedicated to studying hard and maintaining his spot in the 1% of his class. However, Si-eun runs into trouble when bullies begin targeting him. Using his knowledge of physics and quick thinking,Si-eun fights back against his attackers, and gets help from two other classmates.
Over the course of two seasons,Weak Hero Class 1has built up a notable cast of stars. Alongside the three main characters, the K-drama boasts various supporting actors and guest appearances.Weak Hero Class 1is certainly compelling because of its unique premise andcoming-of-age K-drama themes, but it also stands out because of its performances. Those who decide to pick up this K-drama may find themselves falling in love with these South Korean stars.
Park Ji-hoon As Yeon Si-eun
Date of Birth: June 20, 2025
Park Ji-hoon was born in Masan, South Korea. His acting career began at a very young age with minor roles in television series likeJumongandThe King and I.Throughout his teen years, Ji-hoonpivoted to K-pop, training to become an idol singer. He joined the group Wanna One. After their disbandment, he pursued a solo music career. In 2019,he returned to acting, appearing in dramas such asFlower Crew: Joseon Marriage AgencyandLove Revolution. InWeak Hero Class 1,Ji-hoon plays the bright and determined lead character, Yeon Si-eun.
Choi Hyun-wook As Ahn Su-ho
Date of Birth: August 01, 2025
Choi Hyun-wook was born in South Korea. One of his earliest roles came in 2020 when he appeared in the web drama,Pop Out Boy!Afterward, he took on several more small roles untilhis breakout in 2022 when he starred in the coming-of-age drama,Twenty-Five Twenty-One.Soon after, he took on the part of Ahn Su-ho inWeak Hero Class 1.Su-ho is the strongest fighter in his class who cares little about school, but steps up to help Si-eun.
Hong Kyung As Oh Beom-seok
Date of Birth: July 30, 2025
Hong Kyung was born in South Korea. He earned his first role in 2017 in the TV series,Queen of Mystery.For the next few years, he picked up minor parts in K-dramas.His big break eventually came in 2020 when he made his feature film debut in the movieInnocence,which won him a Baeksang Arts Award for Best New Actor. In 2022, he starred inWeak Hero Class 1,which also gave him worldwide attention. Kyung plays Oh Beom-seok, a shy boy who decides to help out Si-eun due to his own past as a victim of bullying.
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Weak Hero Class 1 Supporting Cast & Characters
Lee Yeon as Yeong-i:Lee Yeon is a South Korean actress best-known for playing a 13-year-old boy accused of murder inthe 2022 Netflix drama,Juvenile Justice.InWeak Hero Class 1,she plays Yeong-i, a courageous and beautiful runaway who is the object of the boys' affections.
Shin Seung-ho as Jeon Seok-dae:Shin Seung-ho is an established actor who gained attention for series such asA-Teen, Love Alarm, D.P.,andAlchemy of Souls.He plays Jeon Seok-dae inWeak Class Hero 1,the leader of a group of delinquents who becomes involved with Si-eun and his friends.
Kim Su-gyeom as Jeon Yeong-bin:Although Kim Su-gyeom began acting in 2021,Weak Hero Class 1is the role that allowed him to breakout in the industry. In the role of Jeon Yeong-bin, Su-gyeom plays a school bully who targets Si-eun, and eventually escalates his violence to concerning proportions.
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Cha Woo-min as Kang Woo-young:Cha Woo-min is a relatively new actor who is known for appearing inNight Has ComeandStudy Group.InWeak Hero Class 1,he plays an MMA fighter who holds a grudge against Su-ho.
Na Chul as Kim Gil-soo:Na Chul was a South Korean actor who took on roles inVincenzo, Happiness,andLittle Women.He portrayed Kim Gil-soo inWeak Hero Class 1,a villain who runs a gang and scams teenagers out of money through a gambling app.
Gong Hyun-joo as Si-eun’s mother:Known forYou Are My DestinyandHotel King,Gong Hyun-joo plays Si-eun’s mother, a math teacher who is constantly busy.
Kim Sung-kyun as Gyu-jin:Kim Sung-kyun is a long-time actor best known for series such asNameless Gangster: Rules of the Time,theReplyseries,D.P.,andDivorce Attorney Shin.He plays Gyu-jin, Si-eun’s father and judo coach.
Jo Han-chul as Oh Jin-won:Jo Han-chul has appeared inVincenzo, Hometown Cha-Cha-Cha,andGyeongsong Creature.InWeak Hero Class 1,he plays Beom-seok’s cruel assemblyman father.
