The first season of Weak Hero Class 1 didn't just drop on our screens; it absolutely wrecked us. Park Ji-hoon’s portrayal of Yeon Si-eun—that quiet, calculating, and slightly terrifying genius—left a massive crater in the landscape of high school noir dramas. But now, with the shift from Wavve to Netflix, the stakes for the Weak Hero Class 2 cast have skyrocketed. People are worried. They’re excited. Mostly, they’re just desperate to know if this new lineup can actually hold a candle to the lightning-in-a-bottle chemistry we saw in the first installment.
It’s a lot of pressure. Imagine stepping into a sequel where the predecessor is basically considered a masterpiece of the genre.
Honestly, the transition to Netflix is the best thing that could have happened for the production budget, but it also means the Weak Hero Class 2 cast has to appeal to a massive, global audience that might not even know the webtoon exists. We aren't just looking at a few new faces; we're looking at a complete overhaul of Si-eun’s social circle.
The return of the king: Park Ji-hoon stays put
Let’s get the most important bit out of the way. Park Ji-hoon is back. Thank God.
Without him, there is no show. Period. He managed to turn a former idol image into one of the most chilling "don't mess with the quiet kid" performances in recent memory. In the upcoming season, officially titled Weak Hero Class 2 (or Weak Hero Class 1 Part 2 depending on who you ask at Netflix), Ji-hoon reprises his role as Yeon Si-eun.
But he’s in a different headspace now. He’s transferred to Eunjang High School. He’s carrying the trauma of what happened to Su-ho. If you’ve read the webtoon, you know Eunjang is where the real "Weak Hero" legend begins. Ji-hoon’s performance needs to bridge that gap between the broken boy we left behind and the strategic fighter who becomes a pillar for the "Eunjang Union."
Ryeoun as Park Hoo-young: The powerhouse addition
The biggest buzz surrounding the Weak Hero Class 2 cast involves Ryeoun. If you watched Twinkling Watermelon, you know he has that "leading man" charisma, but this is a total 180-degree turn.
He plays Park Hoo-young.
In the source material, Hoo-young isn't just some background character. He’s pivotal. Ryeoun has to balance a certain level of intensity with a believable physicality. Netflix casting him was a smart move—he's got the acting chops to handle the dark, gritty tone of a script that involves brutal bullying and high-stakes gang politics. He isn't just a "pretty boy" addition; he's the muscle and the heart of the new group.
Meet the new Eunjang crew: Choi Min-yeong and Lee Min-jae
Rounding out the core Weak Hero Class 2 cast are some names you might recognize if you spend too much time on K-drama Twitter.
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Choi Min-yeong, who people might remember from XO, Kitty, is stepping into the role of Seo Joon-tae. This is an interesting choice. Joon-tae is a character that requires a lot of vulnerability. He’s the one who often needs protection, but his loyalty is what keeps the group together. Seeing Choi move from a teen rom-com vibe to the brutal world of Weak Hero is going to be a litmus test for his range.
Then there’s Lee Min-jae as Go Hyun-tak.
Hyun-tak is a fan favorite in the webtoon. He’s hot-headed. He’s loyal to a fault. He’s basically the spark plug of the Eunjang trio. Lee Min-jae has that rugged, "rough around the edges" look that fits the character perfectly.
Why this chemistry matters more than the plot
You can have the best fight choreography in the world—and let’s be real, Weak Hero has some of the best—but if you don't care about the kids getting hit, it doesn't work. The first season worked because of the tragic breakdown of the friendship between Si-eun, Su-ho, and Beom-seok.
The new Weak Hero Class 2 cast has the impossible task of making us move on from Su-ho. (We aren't over it, by the way).
- Yeon Si-eun (Park Ji-hoon): The protagonist who fights with his brain and whatever object is nearby.
- Park Hoo-young (Ryeoun): The new heavy hitter.
- Seo Joon-tae (Choi Min-yeong): The glue holding them together.
- Go Hyun-tak (Lee Min-jae): The emotional firecracker.
It’s a different dynamic. It’s less about three outcasts and more about an actual alliance.
The Villains: Bae Na-ra and Lee Jun-young
A hero is only as good as the person trying to ruin their life. The Weak Hero Class 2 cast includes some genuinely intimidating antagonists.
Lee Jun-young (from D.P. and Mask Girl) is joining the fray. This guy is a specialist in playing characters that make your skin crawl. He has this ability to look perfectly normal one second and absolutely psychotic the next. While his specific role has been kept under wraps by some production leaks, the consensus is that he represents the "Alliance"—the massive network of delinquent schools that Si-eun eventually has to dismantle.
Bae Na-ra is also in the mix. After his breakout in D.P. 2, he’s proven he can handle high-intensity, physical roles.
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The villains in the second season aren't just school bullies. We're moving into organized crime territory here. We're talking about the "Manwol" gang and the higher-ups who treat these high school fights like a gambling ring. The scale is just... much bigger.
Changing the guard: From Wavve to Netflix
You might be wondering why it took so long for the Weak Hero Class 2 cast to be finalized.
It mostly came down to money. Wavve, the original streaming platform, ran into some financial hurdles. Netflix saw the international success of the first season and swooped in. This is why the production value is expected to look significantly more "expensive."
However, Netflix also has a habit of making things a bit more "polished." Part of the charm of the first season was how raw and indie it felt. The lighting was sickly and yellow; the fights felt desperate. Fans are worried that the Netflix machine might make it too "clean."
But with the original director, Yoo Su-min, still at the helm, the DNA of the show should remain intact. He knows these characters. He knows that the Weak Hero Class 2 cast needs to feel like they’re actually in danger, not like they’re in a stylized music video.
Addressing the Su-ho shaped hole in our hearts
Let’s talk about the elephant in the room: Choi Hyun-wook.
His portrayal of An Su-ho was the soul of the first season. Because of the way the first season ended (and how the webtoon progresses), he isn't a main fixture of the Weak Hero Class 2 cast. This is a bitter pill for fans to swallow.
There are rumors of cameos. Flashbacks are almost a certainty. But the story moves forward. Si-eun is at Eunjang now. He is a changed person because of Su-ho, but he has to find a new reason to fight. The "Weak Hero" title refers to his physical stature, but his strength comes from the trauma he’s trying to process.
What to expect from the Eunjang High arc
In the webtoon, Eunjang High is known as a "trash bin" school. It's where the kids who have no other options end up.
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When Si-eun arrives, he just wants to study. Again. But the Weak Hero Class 2 cast will portray the inevitable friction that happens when a "top dog" from another school enters a new ecosystem. The "Eunjang Union" isn't a gang—it's a defensive line.
- The Conflict: The Union vs. The Alliance.
- The Strategy: Si-eun using the environment to win fights he shouldn't.
- The Growth: Si-eun learning to trust people again after the Beom-seok betrayal.
Is the hype actually justified?
K-drama sequels are notoriously hit-or-miss. For every D.P. 2 that holds up, there’s a Sweet Home 2 that gets a bit messy.
The reason people are optimistic about the Weak Hero Class 2 cast is the source material. The "Eunjang High" arc is widely considered the peak of the webtoon. It introduces the most iconic characters and the most creative fights.
If Park Ji-hoon can maintain that "dead-eyed" intensity, and if the chemistry between Ryeoun and Lee Min-jae clicks, we’re looking at a show that could surpass the original.
Why you should keep an eye on Yu Su-bin
One more name to watch in the Weak Hero Class 2 cast is Yu Su-bin. He appeared briefly at the very end of season one as the person Si-eun "dealt with" before transferring. He’s back, and his role as Choi Hyo-man is going to be the bridge between the old world and the new. He represents the lingering consequences of Si-eun’s past.
What you need to do before the premiere
Don't go into this blind. If you want to appreciate the Weak Hero Class 2 cast and their performances, there are a few things you should handle first.
First, go back and re-watch the finale of Season 1. Pay close attention to Si-eun’s face in the final scene. That’s the starting point for Season 2.
Second, if you can, read the first 50 chapters of the webtoon. It helps you understand why characters like Go Hyun-tak are so beloved. It makes the casting choices make way more sense.
Lastly, manage your expectations regarding the "original trio." This is a new chapter. It’s going to feel different. It’s going to be more violent. It’s going to be more "Netflix." But the heart of the story—a kid who refuses to be a victim—is still there.
The Weak Hero Class 2 cast has a massive burden to carry, but the talent involved suggests they’re more than up for the challenge. Get ready for more fire extinguishers, more pens used as weapons, and a lot more trauma. It's going to be a wild ride.