955 days. That’s how long it took Kiwoom Heroes right-hander An Woo-jin to throw another pitch in a KBO League game — and when he finally did, on April 12, 2026, the radar gun read 159 kilometers per hour, roughly 98.8 miles per hour. For a pitcher many scouts and Korean baseball writers had already labeled the most talented arm of his generation before his suspension, the number confirmed what the KBO world had been waiting two and a half years to find out: the stuff never left. Only the games did.
An Woo-jin’s return is one of the more closely watched storylines in the KBO League this season, not because of a dramatic highlight-reel finish, but because of what it represents — a generational talent, sidelined by a school-violence scandal in 2023, finally back on a professional mound, throwing as hard as he ever did. This piece walks through who An Woo-jin is, what happened to sideline him, what his comeback has actually looked like on the field, and why 2026 is being treated as a deliberate, cautious build-up rather than a full-scale return.
Who Is An Woo-jin?
An Woo-jin is a 26-year-old right-handed starting pitcher for the Kiwoom Heroes, one of ten clubs in South Korea’s top professional baseball league, the KBO League. Before his suspension, he was already being discussed as one of the most talented pitchers to come through the KBO in years — a power arm with swing-and-miss stuff and the kind of peripheral numbers that made him a fixture at the top of the league’s pitching leaderboards.
In the 2022 season, An led the entire KBO League in both earned run average (ERA) and strikeouts — a rare double that put him in the conversation for the league’s best pitcher, full stop. He backed that up in 2023 by finishing as the runner-up in both categories, meaning that across two consecutive seasons, no pitcher in the KBO produced a better combination of run prevention and swing-and-miss stuff than An Woo-jin, save for whoever narrowly edged him in the strikeout column in 2023. For American readers unfamiliar with the KBO, leading the league outright in ERA and strikeouts in the same season is the pitching equivalent of a Cy Young-caliber year — the kind of season that gets a young pitcher’s name mentioned in trade rumors, national team conversations, and eventually, posting speculation.
Then, in the middle of that trajectory, everything stopped.
What Happened in 2023
In 2023, An Woo-jin became the center of a school-violence scandal that resulted in a suspension from the KBO League. The specifics of the disciplinary process and the underlying allegations have not been independently detailed in the sourcing behind this article, and we won’t speculate beyond what’s been reported: a school-violence controversy led directly to his suspension, and that suspension kept him off a KBO mound for the remainder of that season and all the way through 2024 and 2025.
What is clear, and verifiable, is the timeline. An Woo-jin’s last KBO first-team appearance before the suspension came on August 31, 2023. From that date forward, one of the league’s most dominant young arms simply wasn’t available to any KBO club — not for the rest of that pennant race, not for the following season, and not for the one after that. In a league where a starting pitcher’s prime years are precious and short, watching a 23-year-old ace disappear from the mound for what would eventually stretch past two and a half years was, for Kiwoom fans and KBO followers generally, a genuinely painful watch.
School-violence scandals carry serious weight in Korean sports and Korean society more broadly — they’re treated as far more than a public-relations problem, and suspensions tied to them tend to be lengthy and non-negotiable regardless of a player’s on-field value. An Woo-jin’s case fit that pattern. There was no expedited path back. He simply had to wait it out, season after season, while his once-ascendant career sat frozen.
The Comeback: April 12, 2026
An Woo-jin finally returned to a KBO mound on April 12, 2026 — exactly 955 days after that last appearance on August 31, 2023. In baseball terms, 955 days is not a short rehab assignment or a late-season call-up delay; it’s the better part of three full seasons, an amount of missed competitive innings that would leave most pitchers rusty, mechanically inconsistent, and well below their previous stuff, at least early on.
An Woo-jin was not rusty. In that comeback outing, his fastball touched 159 kilometers per hour on the stadium radar gun — approximately 98.8 miles per hour in the units US readers are more familiar with. That’s elite velocity in any professional baseball league in the world, not just the KBO. For a pitcher who hadn’t faced professional hitters in nearly two and a half years, hitting a number like that in his very first game back was as strong a signal as Kiwoom could have hoped for: whatever the layoff had cost him, it hadn’t cost him his arm.
That kind of velocity retention after such a long absence isn’t something every pitcher achieves. Extended time away from competitive innings — for injury, suspension, or any other reason — often shows up first in diminished fastball velocity, since arm strength and mound conditioning are notoriously difficult to fully replicate outside of live competition. An Woo-jin coming back and immediately sitting at 98-plus miles per hour suggested a level of physical preparation and training discipline during the suspension that matched the talent everyone remembered from 2022 and 2023.
The Numbers: 159 km/h After 955 Days
The comeback outing wasn’t a one-time velocity spike, either. In a more recent 2026 start against the KIA Tigers at Gocheok Sky Dome — Kiwoom’s home ballpark in Seoul — An Woo-jin threw four scoreless innings, allowing just one hit and two walks while striking out four batters. And once again, his fastball touched 159 km/h, matching the number from his return outing months earlier.
That repeat performance matters more than it might seem at first glance. A single strong outing after a long layoff can always be written off as an outlier — adrenaline, a favorable opponent, a hot night. A second start, months later, showing the same velocity and the same shutdown results is a much stronger data point. It suggests a pitcher who has settled back into game conditions rather than one riding a short-term spike in stuff that’s likely to fade as the season wears on.
Four scoreless innings with four strikeouts and only one hit allowed is, by any measure, a dominant start — the kind of line that would headline a game recap regardless of the pitcher’s backstory. That it came from someone who had been completely off the field for the better part of three seasons is what makes it a story worth telling to an audience well beyond Kiwoom’s own fanbase.
Why Kiwoom Is Managing Him Carefully in 2026
Despite the encouraging results, the Kiwoom Heroes organization is not treating 2026 as An Woo-jin’s full return to ace-level workload. Instead, the club is managing this season as a deliberate rehabilitation and build-up year — limited innings, short starts, and careful handling designed to protect a pitcher who is still working his way back from an unusually long competitive layoff, rather than pushing him straight back into a 180-inning workload.
That caution makes sense from a pure roster-management standpoint. Pitchers who return from extended absences — regardless of the reason for the absence — are at elevated risk for arm injuries if they’re immediately asked to carry a normal starter’s workload. Building up pitch counts, innings totals, and start frequency gradually across a full season is standard practice for any pitcher coming back from a long layoff, and it’s exactly what Kiwoom appears to be doing with one of the most valuable arms in franchise history.
According to reporting from Korean outlets tracking his return, the organization and those around the team see 2027 — not 2026 — as the season where An Woo-jin is expected to return to a full-scale workload and reclaim his place among the league’s true frontline starters. In that framing, 2026 isn’t really a comeback season in the traditional sense; it’s the on-ramp to one.
Why This Story Matters Beyond Korea
For a US audience less familiar with the KBO League, the easiest way to understand An Woo-jin’s situation is through a comparison many baseball fans already know instinctively: a hard-throwing, generational-talent starting pitcher who essentially vanished from the game for two and a half years and is now back on the mound throwing as hard as ever. That storyline — a flamethrower returning from a long, uncertain absence — resonates in any baseball culture, regardless of league or country, because the underlying tension is the same. Does the talent survive the layoff? Does the stuff come back? An Woo-jin’s early returns suggest the answer, at least on velocity, is a clear yes.
It’s also worth being precise about what this story is not. This isn’t a redemption narrative built around forgiving or minimizing the 2023 scandal that triggered the suspension — that remains a serious matter, and nothing about a strong fastball changes the fact that An Woo-jin’s suspension stemmed from real, serious misconduct allegations. What’s newsworthy here specifically is the baseball outcome: a suspended pitcher, once regarded as the best pure arm in the KBO, has returned to competitive play and shown, twice now, that his physical talent is fully intact. Those are two separate threads — the disciplinary one and the athletic one — and this piece focuses on the latter, using only what has been verifiably reported about his on-field return.
There’s also a longer-term storyline that KBO watchers are likely to keep an eye on: the possibility that a healthy, fully rebuilt An Woo-jin could eventually draw interest from Major League Baseball clubs through the KBO’s posting system, the mechanism through which Korean players have moved to MLB in the past. To be clear, that is speculation about his long-term career trajectory, not anything that has been reported as a concrete plan or negotiation — there’s no contract detail, timeline, or posting filing to point to here. But for a pitcher who once led the KBO in both ERA and strikeouts in a single season and is now sitting at 98-plus miles per hour again in his mid-20s, it’s the kind of question that naturally follows once his workload is fully built back up in 2027 and beyond.
The Quick Facts
- Player: An Woo-jin, 26, right-handed starting pitcher, Kiwoom Heroes (KBO League)
- Career peak: Led the KBO League in ERA and strikeouts in 2022; finished second in both categories in 2023
- The suspension: Sidelined following a 2023 school-violence scandal; last KBO first-team appearance was August 31, 2023
- The return: Back on a KBO mound on April 12, 2026 — 955 days after his last appearance — hitting 159 km/h (~98.8 mph) in his comeback outing
- Recent form: 4 scoreless innings, 1 hit, 2 walks, 4 strikeouts vs. KIA at Gocheok Sky Dome, again touching 159 km/h
- 2026 plan: Managed as a build-up/rehab season with limited innings and short starts; 2027 seen as his full-scale return
Source: Nate Sports, StarNews
Frequently Asked Questions
How good was An Woo-jin before his suspension?
Genuinely elite by KBO standards. He led the entire league in both ERA and strikeouts in 2022, then finished as the runner-up in both categories again in 2023. Producing a top-two finish in both the league’s primary run-prevention stat and its primary strikeout stat across two consecutive seasons is the kind of resume that put him firmly in the conversation as the best pure pitching talent in the KBO at the time of his suspension.
Why was An Woo-jin suspended?
He was suspended following a school-violence scandal that surfaced in 2023. The specific allegations and disciplinary details beyond that have not been laid out in the reporting this article draws on, so we’re not speculating further — what’s verifiable is that the scandal led to his suspension, and that his last KBO first-team appearance before it was August 31, 2023.
How long was An Woo-jin actually out of the KBO League?
955 days — from his final appearance on August 31, 2023, to his return on April 12, 2026. That gap spans the remainder of the 2023 season and the entirety of the 2024 and 2025 seasons, meaning An Woo-jin missed roughly two and a half full KBO seasons during what would typically be considered the prime years of a starting pitcher’s career.
Is 159 km/h actually good velocity?
Yes — 159 kilometers per hour converts to roughly 98.8 miles per hour, which is elite fastball velocity in any top-level professional baseball league, KBO or MLB. What makes it especially notable in An Woo-jin’s case is the context: he hit that number in his very first game back after nearly two and a half years away from competitive baseball, and then matched it again months later in a dominant four-inning shutout start against KIA. Consistency at that velocity, after that long a layoff, is a strong indicator that his physical stuff has fully returned.
Will An Woo-jin pitch a full workload in 2026?
No — Kiwoom is treating 2026 as a deliberate build-up and rehabilitation season, using limited innings and short starts rather than a full starter’s workload. Based on reporting around the team’s plans, 2027 is being viewed as the season when An Woo-jin is expected to return to a full-scale role as a frontline starter.
Looking Ahead
It’s worth sitting with just how unusual An Woo-jin’s situation is within professional baseball. Pitchers lose development time to injuries constantly — Tommy John surgery alone can cost a starter a full calendar year or more — but a 955-day gap driven by an off-field suspension, rather than a physical injury, is a different kind of absence entirely. There was no surgery to rehab from, no throwing program dictated by a medical team’s recovery timeline. There was simply a long, indefinite wait, with no professional innings to point to as proof the talent was still there — until, suddenly, there was.
That’s part of why the velocity readings from his return outings carry so much weight among KBO followers. Talent evaluators can debate mechanics, command, and secondary pitches all they want, but a radar gun reading of 159 km/h is not up for interpretation. It’s a number, and it’s the same number he was sitting at when he was the best pitcher in the league. For a fanbase that spent two and a half seasons wondering whether their ace would ever look like himself again, that number did a lot of the talking.
The next real test isn’t velocity — it’s volume. Kiwoom’s cautious, build-up approach through 2026 means the league won’t get a full picture of An Woo-jin the frontline starter again until 2027 at the earliest, when he’s expected to be stretched back out to a normal starter’s workload across a full season. Between now and then, every start he makes will be watched less for the final line and more for whether the stuff holds up as his innings gradually climb — whether the same fastball that touched 98.8 miles per hour in four-inning bursts can still be there deep into a start, and deep into a season, once the training wheels come off.
There’s also a broader storyline sitting quietly behind all of this for KBO followers with an eye on the international game. A healthy, fully built-back-up An Woo-jin pitching like a 2022-vintage ace again in 2027 would immediately put him back into conversations about Korea’s best pitching talent — and, eventually, about whether that talent could be tested at the very highest level via MLB’s posting system down the road. None of that is confirmed or reported as anything concrete right now, and it shouldn’t be treated as such; it’s simply the natural trajectory that tends to follow when a pitcher this talented starts stacking dominant, healthy starts again. For now, the story is simpler and, in its own way, more remarkable: a 26-year-old who hadn’t thrown a competitive pitch in nearly three years took the mound again and looked, immediately, like nothing had changed at all.
For American readers just discovering An Woo-jin’s name through this comeback story, the frame is a familiar one even without knowing a single KBO statistic beyond what’s here: a generational arm went dark for two and a half seasons under difficult circumstances, and came back throwing as hard as the day he left. Whatever happens with his workload, his role, or his long-term trajectory from here, that first radar gun reading — 159 km/h, 955 days later — is already the number that will anchor how this comeback gets remembered.