The Ultimate Guide To The Weak Hero Class 2 Cast: Roles, Bios, And New Student Drama

The highly anticipated sequel, Weak Hero Class 2, is officially here, premiering on Netflix on April 25, 2025, and fans are buzzing over the confirmed cast lineup that promises an even more intense and emotionally charged narrative. This season picks up immediately after the devastating climax of the first, following Yeon Si-eun's transfer to Eunjang High School, where he faces a new, more formidable set of challenges and a whole new cast of friends and enemies. The blend of returning stars and fresh faces, including former idol Park Ji-hoon and rising star Ryeoun, ensures a stellar performance as Si-eun navigates a dangerous new environment where he must fight not just for himself, but for his new allies.

This exclusive guide breaks down the full, confirmed cast, detailing their roles, previous works, and how their characters will shape the brutal world of Eunjang High School. From the returning genius Yeon Si-eun to the sadistic new antagonists, get ready for a deep dive into the actors who bring this beloved webtoon adaptation to life.

The Confirmed Weak Hero Class 2 Cast and Character Biographies

The core cast of Weak Hero Class 2 features a powerful ensemble of both returning actors and new additions, each bringing a unique energy to the high-stakes action drama. The sequel shifts the setting to Eunjang High School, introducing new key figures who will either become Si-eun’s staunch allies or his most dangerous rivals.

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• Park Ji-hoon as Yeon Si-eun: The protagonist returns. After the traumatic events of the first season, the former top student transfers to Eunjang High School, carrying the burden of his past actions. Si-eun, known for his cold demeanor and strategic fighting style, must now find a new purpose and new allies in this unfamiliar territory. Ji-hoon is a former member of the K-Pop group Wanna One and has successfully transitioned into an acclaimed actor, with his performance as Si-eun being a career highlight.
• Ryeoun as Park Hu-min (a.k.a. Baku): Park Hu-min is one of the new main characters Si-eun befriends at Eunjang High. His nickname, Baku, hints at a powerful, perhaps volatile, nature. Ryeoun is a prominent rising star, known for his lead roles in popular K-dramas like Twinkling Watermelon and The Secret Romantic Guesthouse, bringing significant star power to the ensemble.
• Choi Min-yeong as Seo Jun-tae: Seo Jun-tae is another key student at Eunjang High who becomes an ally to Si-eun. He is portrayed as an initial target of the school's gang of thugs, which draws him into Si-eun's orbit. Choi Min-yeong gained international recognition for his role as Dae in the Netflix series XO, Kitty, making his performance as Jun-tae highly anticipated.
• Lee Min-jae as Go Hyeon-tak (a.k.a. Alex Go): Go Hyeon-tak is the third member of Si-eun's new trio of friends at Eunjang High. His character is noted for bringing exceptional action-acting skills to the series, suggesting he will be a key player in the show’s fight sequences. Lee Min-jae is recognized for his role in the drama Crash Course in Romance, and his martial arts training is expected to be showcased in this action-heavy role.
• Lee Jun-young as Geum Seong-je (a.k.a. Wolf Keum): The new major antagonist. Geum Seong-je is introduced as the sadistic and magnetic lieutenant of the Union, a powerful gang. His unpredictable brutality makes him a formidable rival to Yeon Si-eun. Lee Jun-young has a history of excelling in antagonist roles and is also known for his work in When Life Gives You Tangerines.
• Bae Nara as Na Baek-jin: Na Baek-jin is described as a "variable" in the new season, a captivating character who confronts even greater challenges, suggesting a complex role that may shift between antagonist and ally. Bae Nara is a musical singer and actor, known for his memorable performance in D.P. 2.
• Yoo Soo-bin as Choi Hyo-man (a.k.a. Colton Choi): Yoo Soo-bin takes on a significant support role as Choi Hyo-man. Interestingly, the actor initially refused the role multiple times due to the pressure of working with his brother, Yoo Soo-min, who is the director and screenwriter for the series.

The New Battleground: Eunjang High School and the Union

The transition from the first season's intense but localized conflicts to the broader, more organized violence of Weak Hero Class 2 is a major plot point. The core intention of the sequel is to explore the consequences of Yeon Si-eun’s actions and his attempt at a fresh start. Si-eun’s transfer to Eunjang High School is not a peaceful retreat; rather, it plunges him into a new hierarchy dominated by the powerful gang known as the Union.

Eunjang High becomes the new battleground where Si-eun’s intellectual prowess and brutal, strategic fighting skills are tested against a new level of organized crime. The introduction of characters like Park Hu-min, Seo Jun-tae, and Go Hyeon-tak signifies Si-eun's attempt to rebuild the camaraderie he lost, forming a new, albeit fragile, circle of friends. This dynamic of forming alliances in a hostile environment is central to the season's plot, answering the audience's curiosity about how the lone wolf will survive and evolve.

The presence of Lee Jun-young’s character, Geum Seong-je, as the Union’s lieutenant, immediately raises the stakes. While the first season dealt with school bullies and local gangs, the Union represents a more structured and widespread threat. Seong-je, nicknamed "Wolf Keum," is not just a thug but a magnetic, unpredictable force whose sadism will push Si-eun to his limits, forcing him to adapt his tactics against a more experienced and ruthless opponent.

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What to Expect from the Weak Hero Class 2 Storyline and Production

Weak Hero Class 2 is set to deliver eight episodes of high-octane action and deep character drama, maintaining the same dark, gritty tone that made the first season a global hit. The sequel is directed and co-written by Yoo Soo-min, ensuring a continuity of vision and style that fans expect. The production team’s commitment to a faithful yet fresh adaptation of the webtoon is evident in the meticulous casting of actors who can embody the characters' complex emotional and physical demands.

The Topical Authority of Character Development

A major draw for the series is the intense character development, especially for Yeon Si-eun. Park Ji-hoon has been praised for his ability to transform from a beloved K-Pop idol into an intense, focused actor, perfectly capturing Si-eun’s cold exterior and inner turmoil. His performance in the second season is expected to delve deeper into the psychological toll of his past fights and his struggle to protect his new friends. The emotional depth provided by the returning star is a key element of the show's topical authority.

The new cast members also add layers of topical authority by introducing new relationship dynamics. Ryeoun's character, Park Hu-min, is anticipated to become the new emotional anchor for Si-eun, similar to the role of his former friend. Meanwhile, the dynamic between Si-eun and the antagonist Geum Seong-je is set to be a central, explosive rivalry, driving the main action of the season. The show's focus on themes like loyalty, betrayal, and the harsh realities of the South Korean school system continue to resonate deeply with its global audience.

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The Anticipated Release and Global Reach

With the entire eight-episode season dropping on Netflix on April 25, 2025, the show is poised for an immediate global impact. The move to Netflix as the primary distributor for the sequel, after the first season's success on Wavve, significantly expands its international reach. This strategic distribution choice confirms the series' status as one of the most anticipated K-dramas of the year, solidifying the franchise's place in the pantheon of successful webtoon-to-drama adaptations. The strong, confirmed cast and the promise of a more brutal and complex storyline are the main reasons why Weak Hero Class 2 is expected to dominate streaming charts worldwide.