KBO’s Kiwoom Heroes Post Infielder Sung-mun Song
The Kiwoom Heroes of the Korea Baseball Organization have agreed to post infielder Sung-mun Song, reports Jeeho Yoo of Yonhap News. The KBO posting window is 30 days (unlike the 45-day period for players coming over from Japan’s NPB). MLB teams will officially be able to negotiate with Song, whom Yoo adds has hired ISE Baseball to represent him, on Saturday morning. He’ll need to sign by 5:00 pm Eastern on December 21 or remain with the Heroes.
Song, 29, is a left-handed hitter who has played all nine seasons of his career with that club. He posted a sub-.700 OPS every year between 2021-23 but has taken a leap forward at the plate over the past two years. Song hit .340/.409/.518 last year and is coming off an equally impressive ’25 campaign. He popped a career-best 26 home runs with a .315/.387/.530 slash across 646 plate appearances.
Among 30 KBO hitters with 500+ trips to the dish, Song finished sixth in both average and on-base percentage and was third in slugging. He also finished third in home runs (albeit well behind former MLB first baseman Lewin Díaz’s league-best 50 longballs). Song walked at a 10.5% rate while striking out 14.9% of the time. The strikeout rate would be excellent against big league pitching but is only a little better than average in Korea, where the velocity is lower and hitters put far more balls in play.
Eric Longenhagen of FanGraphs gave Song a 45 FV grade, which is commensurate with a mid-level prospect from the typical organization’s top 30 list. Longenhagen credited him with plus power to the pull side and a plus arm at third base, where he has spent most of his KBO career. He’s a good athlete who stole 25 bases this year and has gone 46-48 in stolen base attempts over the past two seasons.
The biggest question is his pure hitting ability. Longenhagen writes that Song has shown a bit of a propensity to chase outside the strike zone and has an uphill swing path that can leave him vulnerable to pitches up in the zone, especially those on the outer half. Readers are encouraged to check out FanGraphs’ full scouting report for more details. Will Sammon and Cody Stavenhagen of The Athletic wrote earlier this month that evaluators with whom they spoke viewed Song more as a utility player than a regular.
Song has some defensive flexibility, but an inability to play shortstop limits his value as a utility piece. He’s primarily a corner infielder who also has almost 1300 innings at second base. The Angels need a third baseman and are looking for a left-handed bat to balance a righty-heavy lineup. The Astros also want to bring in a lefty-hitting infielder, though they’d need to feel comfortable playing Song regularly at second base unless they trade one of Isaac Paredes or Christian Walker. The A’s are in the second and third base markets, while the Mariners could be as well depending on whether they re-sign their own free agents. The White Sox, Pirates, Marlins, Rangers, Diamondbacks, Tigers and Royals (with Maikel Garcia capable of playing second) could all be in the mix for a third baseman.
A signing team would owe a posting fee to the Heroes on top of whatever is guaranteed to Song. That’s proportional to the contract value: 20% of the first $25MM, 17.5% of the next $25MM, and 15% thereafter. It’d be surprising if Song tops $25MM, so the likeliest outcome is that the release fee will be 20% of the guarantee.
Song is the only KBO player known to be on the posting radar this offseason. First baseman Baek-Ho Kang was reportedly considering an MLB move, but he signed a four-year contract with the KBO’s Hanwha Eagles this week. While Cody Ponce is expected to return to MLB after a dominant KBO season, he’ll do so as a free agent rather than via the posting system. There are three much higher-profile NPB players making the jump via the posting system: Tatsuya Imai, Munetaka Murakami and Kazuma Okamoto. Japanese righty Kona Takahashi is also being posted but will command a far lower contract than the other three.
Baek-Ho Kang Planning To Pursue MLB Opportunities
Korean utility player Baek-Ho Kang has hired Paragon Sports to represent him as he plans to pursue major league opportunities, reports Jon Heyman of The New York Post. Heyman adds that Kang will be a full free agent, not subject to the posting system.
Kang just turned 26 at the end of July. Despite his young age, he is currently in his eighth season with the KT Wiz of Korea’s KBO League. Kang debuted way back in 2018 when he was just 18 years old.
He has some good seasons under his belt, though his earlier campaigns were stronger than his more recent ones. From 2018 to 2021, he got into at least 116 games each season and stepped to the plate at least 505 times. He hit 81 home runs over that span while producing a combined .325/.408/.521 line and 145 wRC+. He won Rookie of the Year honors in 2018 and was an All-Star from 2018 to 2020.
Since then, his work has declined in both quality and quantity. Per his scouting report on The Board at FanGraphs, he “broke his toe falling down a flight of stairs before the 2022 season started, then partially tore his hamstring just a few weeks after he returned. A bout with anxiety shelved him for a month in 2023, and his season ended with an oblique tear.”
In 2022, he only got into 62 games and slashed .245/.312/.371 for a wRC+ of 86. Since then, he’s been an above-average hitter but not to his previous level. Over the 2023-25 seasons, he has a combined .276/.353/.456 line and 114 wRC+. He only got into 71 contests in 2023. He got that up to 144 last year but has only appeared in 62 games so far this year. He hit 26 home runs last year but his .289 batting average and .360 on-base percentage weren’t up to his previous level.
Perhaps MLB clubs will have differing opinions on whether Kang can get back to that higher level or not. Earlier in his career, when he was showing 20-30 home run power along with strong on-base numbers, his production was somewhat analogous to Ha-Seong Kim‘s KBO years. Kim hit between 19 and 30 home runs in his final six KBO seasons. In his last two, 2019 and 2020, he slashed .307/.393/.507 for a 142 wRC+.
Kim was able to parlay that into a four-year, $28MM deal and become an effective big leaguer. He didn’t do much in 2021 but was a solid player for the next three years. From 2022 to 2024, he slashed .250/.336/.385 for a 106 wRC+ while stealing 72 bases and providing strong glovework at multiple positions. He hasn’t been in good form in 2025, though he may still be getting into game shape after recovering from shoulder surgery.
Kang won’t be as appealing as Kim in terms of his glovework, though he does provide some defensive versatility. Kang has played first base, the outfield corners and a bit at the catcher position as well.
Interest from affiliated clubs likely depends on whether they think his bat can play against MLB pitching. In October of last year, it was reported that a status check was tendered on Kang. An MLB club is required to tender a status check when interested in a KBO player, so that means at least one club was curious about Kang last winter. It was reported at that time that Kang was not interested in making an MLB move but that has apparently changed now that he’s approaching free agency.
MLB Tenders Status Check On KBO Infielder Hyeseong Kim
The Korea Baseball Organization announced last night that MLB has tendered status checks on two players: second baseman Hyeseong Kim and first baseman/catcher Baek-Ho Kang (h/t to Dan Kurtz of MyKBO.net). That indicates both players are on the radar of at least one MLB team, though only Kim seems likely to make the jump this offseason.
A status check is the process used when an MLB team shows interest in a Korean player. MLB does not reveal the identity of the team or teams that requested the check. It is not an official opening of the posting process, which begins a 30-day window for a KBO player to negotiate with big league clubs.
The status check doesn’t mean that a player is going to come to MLB, though it’s a necessary first step for any player who eventually does so. Last offseason, status checks presaged postings and MLB deals for Jung Hoo Lee and Woo-Suk Go. MLB also conducted a status check on free agent reliever Deok Ju Ham, but he elected to re-sign with his KBO team a few weeks later.
Regarding Kim, the status check is a formality. The lefty-hitting infielder (not to be confused with MLB free agent Ha-Seong Kim) has prepared for a move to MLB since last winter. Kim has played parts of eight KBO seasons with the Nexen/Kiwoom Heroes. The Heroes announced in January that they would make him available to major league clubs during the 2024-25 offseason via the posting system. Kim hired CAA as his representation in June.
The 25-year-old hit .326/.383/.458 across 567 plate appearances this year. He’s a career .304/.364/.403 hitter. KBO pitching is much weaker than it is at the major league level. Scouting reports generally suggest Kim profiles as a utility player. MLB teams enamored with his glove could view him as a low-end regular at second base. He doesn’t have a ton of power upside, as this year’s 11 home runs represent a career high. Kim will very likely be posted later in the offseason. Last year, the Heroes waited until early December to post Lee. The LG Twins did the same with Go.
Kang, who plays for the KT Wiz, is reportedly not interested in pursuing an MLB opportunity at this time. Kurtz points to a Korean-language report from Sports Kyunghang in which team officials say that they confirmed with Kang that he intends to remain with the Wiz despite the status check. (The status check is only an indication that an MLB team is interested in the player, not the other way around.) Kang hit 26 home runs with a .289/.360/.480 batting line this season. FanGraphs wrote last offseason that Kang had plus power but projected as a first baseman with questions about his pure hitting ability as an MLB prospect.