by Jongho Kim
Kiwoom Heroes are a club with a unique character within the KBO League. In their history, they are the only self-sustaining team in the KBO without a parent corporation. Even so, they have produced as many as five Major League players in a short span of time. This article introduces Kiwoom Heroes and tells the stories of how they sent their core players to the big leagues.
A Poor Club, the Heroes

In 2008, the Heroes were newly formed by taking over the players and coaching staff of the “Hyundai Unicorns” baseball club, which had been dissolved the year before. On paper they were a new expansion team, but people in the baseball world and the fans regarded the Heroes as the successor to Hyundai. The Heroes based themselves in the capital city of Seoul, but the fan base of Seoul was already shared between two founding year clubs from 1982, the LG Twins and the Doosan Bears. Because of this, the Heroes’ fan base came to be made up mainly of underdog oriented fans whose loyalty was not tied to the home region and fans in the southwestern part of Seoul, such as Guro District, Geumcheon District, and Yangcheon District, which are relatively close to the home stadium.


Other KBO baseball clubs are operated as subsidiaries of large corporations. Even when a club takes a loss, the parent company adds hundreds of billions of won each year to the team’s finances as support. By contrast, the Heroes operate as a business entity themselves. Therefore, the club must gather its operating funds by recruiting sponsors from various companies. The fact that the Heroes have no parent company has, in an ironic way, made it easier for them to sign large-scale sponsorship contracts. For example, large corporations like Lotte or Samsung, which have many subsidiaries in a wide range of industries, are reluctant to have companies that compete with their subsidiaries appear as sponsors of their baseball clubs. The Heroes, however, have been able to recruit partner companies from a variety of industries as sponsors. The club divides its sponsors into six tiers, including Main Partner, Platinum, Gold, Silver, Bronze, and General Partner. Depending on the tier, sponsors receive priority in placing their advertisements in visible spots such as on helmets, jerseys, and caps, and on the outfield fences of the ballpark. As of 2025, 49 companies are participating as sponsors of the Heroes.

The largest source of income for Kiwoom is its naming sponsorship agreements. The sponsor at the very top tier, the Main Partner, fills this role. Over the years, many companies have provided funds and promoted their brands by entering into naming sponsorship agreements. Woori Tobacco in 2008, Nexen Tire from 2010 to 2018, and Kiwoom Securities from 2019 have each represented the club with their names. The reason the team is currently called Kiwoom Heroes is that Kiwoom Securities agreed to pay the club fifty billion won over five years. In this way, the present-day Heroes stand in a situation that is completely different from the days when the Hyundai Unicorns, backed by the support of the large Hyundai conglomerate, were one of the most powerful teams in the league.

The Background of Producing Major Leaguers
Even so, compared to other clubs, the Heroes’ financial condition has not been good, and they have had to tighten their belts every year. The easiest method for the club to secure cash has been selling players. From the early days of the club, the Heroes sustained themselves by transferring starting players through trades or free agency and using the transfer fees and compensation money they received. For example, when they sent away prospects Won-sam Jang, a left-handedpitcher drafted in the Hyundai Unicorns era, and Jae-gyun Hwang, a right-handed hitting infielder, the Heroes received transfer fees of three point five billion won, and two billion won, respectively.
In 2015, when right-handed hitting outfielder Han-joon Yoo, who had hit 20 home runs the year before, and right-handedrelief pitcher Seung-lak Son, a former saves leader, moved as free agents to expansion team KT Wiz and the Lotte Giants, the Heroes received a total of two point four billion won in compensation from those two teams. The club gained revenue, but Heroes fans had to watch their own players display their talents for other teams, which left a bitter feeling. In the end, the production of Major Leaguers was also not a matter of choice but a necessity for the club to survive. Posting fees for overseas transfers are much higher than domestic transfer fees. Because of that, the club encouraged its players all the more strongly to go to the United States. The vacancies left by departing starting players were filled by new players, and the club chose a strategy of “developmental rebuilding,” in which they raised these players as starters and then transferred them again. A representative example of this is the line of shortstops that the team has produced in order, from Jung-ho Kang to Ha-seong Kim to Hyeseong Kim.
The fact that the club gave many opportunities to rookies and maintained a relatively free team atmosphere also contributed greatly to the production of Major Leaguers. In fact, when Jung Hoo Lee won the KBO Rookie of the Year award in 2017, he said in an interview, “I am grateful to the manager for giving many opportunities to someone like me who was lacking.” When Ha-seong Kim received the Golden Glove Award in 2019, he said, “I am grateful to the club for creating an environment where rookies can run around freely.” After the 2025 season, one of the team’s core players, infielder Sung-mun Song, also declared that he would attempt to move to the United States, and the Heroes are now taking on the challenge of producing their sixth Major Leaguer.

(Posting fees and contract amounts were four years, 11 million dollars, four years, 12 million dollars, four years, 28 million dollars, and a three-plus-two-year deal worth 22 million dollars, respectively.)
The Shadow of the Heroes
However, behind this virtuous cycle, there have also been controversies. Although the departures to MLB were presented as success stories, the fundamental way the club operates has not changed significantly. Instead of reinvesting the posting fees in the club’s infrastructure, the Heroes have often cut spending further and chosen cheaper methods, even when signing players. In many cases, they have filled spots that could not be filled with their own prospects by signing players who had been released by other teams. Among such acquisitions, only a few, such as left-handed hitting outfielder Yongkyu Lee, who had been with the Hanwha Eagles, right-handed pitcher Changmin Lim from the Doosan Bears, and right-handed hitting infielder Sunjin Oh from the Lotte Giants, managed to play meaningful roles. The club’s philosophy has also shown itself clearly in the recruitment of foreign players. The Heroes signed left-handed pitcher Andrew Van Hekken for $250,000 in 2012, right-handed pitcher Jake Brigham for $450,000 in 2017, right-handed hitting outfielder Jerry Sands for $100,000 in 2018, and left-handed pitcher Eric Jokisch for $500,000 in 2019, all on relatively low-costdeals. By good fortune, these players became among the best in the league, but not all foreign players turned out that way. Many of the foreign players signed by the Heroes were frequently replaced because of injuries or poor performance.
Even after the club’s finances returned to the black, the Heroes still showed a stingy attitude toward investing in players, and some fans, tired of this, have steadily turned away from the club. On top of this, the Heroes have tried to scoop up even talented amateur players. Since the 2020s, it has become common for the club to trade mid-level players in order to receive draft picks. Through this, the Heroes have obtained more rookies than other teams. However, many Heroes fans express dissatisfaction with the attitude of sacrificing the present while looking excessively only to the future. Then, is the development of the prospects they acquire going well? Recent moves suggest that this is not the case. Right-handedpitcher Jae-young Jang, who joined the club with a huge signing bonus of 900 million won, an unusually large amount for Kiwoom, eventually converted to hitting due to control problems. Yun-ha Kim, known as the nephew of former Major Leaguer Chan Ho Park, has recorded only one win in two seasons and is struggling in the first team. Catcher Dong-heon Kim, who was drafted with a pick obtained by sending away the team’s starting catcher Dong-won Park, missed an entire year after undergoing elbow surgery.
The pillars of the team have left, and as lineups have been filled with players lacking experience, the team’s overall strength has weakened. An even bigger problem is that the second team, which should be the channel for developing players through systematic training, is also weak. The strategy of using rookies immediately in the first team has, in an ironic way, become a cause of weakening the second team, which is responsible for player development. The Heroes often use rookies in the first team in the same season they are drafted. For rookies, it may feel good to get immediate opportunities, but problems of overuse, injuries, and game quality inevitably follow. Even so, with no clear alternatives, a system in which players are developed “by force” in the first team has become fixed.
In the 2025 opening game, eight rookies were registered on active rosters across the ten teams in the league, and three of them belonged to the Heroes. The fact that the Heroes neglect their second team has become known not only to insiders but also to fans. The Heroes’ second team has changed its training base three times, leaving the old Goyang Wondang Baseball Stadium used by the Hyundai Unicorns second team, moving to Gangjin in South Jeolla Province from 2010 to 2013, then to Hwaseong in Gyeonggi Province from 2014 to 2018, and finally returning to Goyang in 2019. In particular, the Gangjin Baseball Stadium in South Jeolla Province, which served as the second team’s training ground from 2010 to 2013, is about 400 kilometers, roughly 248 miles, away from Mokdong Baseball Stadium in Seoul, making it the height of inefficiency. The poor conditions of the stadium and the inadequate meals for second team players became recurring sources of controversy.
In recent years, as KBO clubs have realized the importance of their second teams, they have begun to build new ballparks and invest heavily in player development. The Heroes, who have lacked sufficient financial resources from the beginning, have not been able to even consider such investments. A club that barely has enough to operate the first team has no room to pay attention to the second team, and in the second team, there are no players ready to be called up to the first team, creating a vicious cycle. As these various problems piled up, the Heroes have finished in a distant last place for three consecutive years since 2023. The limits of the low-cost, high-efficiency baseball that the Heroes pursued are now being exposed. Even so, the club is in a situation where it puts its energy only into trading players and collecting prospects, instead of investing in the reinforcement of the roster. Recently, KBO clubs have discussed revisions to the salary cap system. The subject was to create not only an upper limit but also a lower limit in order to induce a certain minimum level of investment. At the KBO board meeting held on September 23, 2025, the league decided on a maximum lower limit of 6.06538 billion won and plans to implement the system beginning in 2027. Many see this as a measure aimed at the Heroes, who invest relatively little. Despite many disadvantages, such as being a self-sustaining club and having a shallow fan base, the Heroes have reached the Korean Series three times and have become the original club of five Major Leaguers. Free from the need to consider a parent company’s interests, the Heroes once created miraculous stories and brought a fresh breeze to the league. Now, however, the Heroes are closer to being the “ugly duckling” of the league than to their past glory. The club’s other nickname, the MLB Academy, can be read as a survival strategy that has been turned into marketing rather than a pure badge of honor.







































