KBO’s Kiwoom Heroes Post Hyeseong Kim

10:41pm: The Heroes announced that the posting window will open at 8:00 am Eastern on Thursday. MLB is evidently waiting until tomorrow to formally notify teams about his availability. Kim will have until 5:00 pm Eastern on January 3 to sign (X link via Yoo).

9:17pm: The KBO announced that the Heroes have officially made Kim available via the posting system. The posting went into effect at noon on Wednesday in South Korean time, not at 12:00 pm Eastern as previously reported. According to Jeeho Yoo of Yonhap News (X link), the 30-day signing period will officially begin at 8:00 a.m. Eastern the morning after MLB informs teams of Kim’s posting.

2:30pm: Infielder Hyeseong Kim is expected to be officially posted by the Kiwoom Heroes of the Korea Baseball Organization on Wednesday at noon Eastern/11am Central, per Jon Morosi of MLB Network (X link). Once it’s official, that will start a 30-day window where all MLB clubs can negotiate with Kim and his representatives. If no deal is signed in that time, he will return to the Heroes for the 2025 season. (The NPB posting window has been expanded from 30 days to 45 days but KBO players still have a 30-day time frame.)

Kim, 26 in January, said himself last week that he believed the formal posting process was about a week away. It appears that timeline is holding, so Kim will be officially be available to MLB clubs as of tomorrow. Kim will be considered a “professional” under MLB rules because he is at least 25 years old and has at least six years of experience in a foreign league. As such, he can sign a deal of any length or dollar amount, depending on what MLB clubs are willing to offer. That’s in contrast to someone like Roki Sasaki, who is only 23 years old and will therefore be capped by the international bonus system.

It isn’t likely that Kim will secure a massive deal, but he could still have some interest. He is expected to provide a somewhat similar skillset to his former double play partner Ha-Seong Kim, no relation, as both players are considered sure-handed defenders at multiple spots on the diamond. Hyeseong has mostly played the two middle infield spots, but also with brief stints at third base and in the outfield corners.

Offensively, Hyeseong is a tick below Ha-Seong, however. Hyeseong has slashed .304/.364/.403 in his eight KBO seasons whereas Ha-Seong hit .294/.373/.493 in his seven campaigns in Korea. The batting average and on-base numbers are fairly close but Ha-Seong clearly has the edge in terms of slugging. Hyeseong got to 11 home runs in 2024, a career high for him, whereas Ha-Seong had 19 or more homers in his final six KBO seasons, including 30 in the final year.

Still, even if Hyeseong is a tick below Ha-Seong in the power department, his youth and athleticism should work in his favor. As mentioned, he is considered a strong defender and could be placed at multiple different positions. He has stolen between 20 and 46 bases in each of the past six seasons.

MLBTR predicted he could secure a three-year deal with a $24MM guarantee as part of the annual Top 50 Free Agents post. However, predicting the interest in a player making the move from overseas can be difficult, as players like Jung Hoo Lee and Masataka Yoshida both proved to have much more earning power than was assumed by forecasters.

The Mariners are reportedly interested in Kim but it stands to reason that plenty of others would be in the mix as well, given his versatility. Clubs like the Giants, White Sox, Marlins, Brewers and others are speculative fits. Players like Willy Adames, Ha-Seong Kim, Gleyber Torres and others are also available in the middle infield free agent market. They will be joined by Hyeseong but the 30-day posting window means there will be clarity on his status by the first few days of 2025, at the latest.

In addition to the money going to Kim, a signing club will also have to pay a posting fee to the Heroes, the value of which will depend upon the size of the contract. The fee will be calculated as 20% of the contract’s first $25MM, plus 17.5% of the next $25MM and 15% of any dollars thereafter. Additional earnings, such as performance bonuses/incentives or salaries on option years fall under that purview once they are unlocked or exercised.