Kim Eung-yong is the only one who led both Team A and Team B to Korean Series championships.

‌If you include the regular season, there are two people, including the late Manager Kim Young-deok.
Every team has a different player composition, strength, and system, so simply rotating the same person cannot work.
Even Kim Eung-yong, who led both Kia and Samsung to Korean Series titles, was criticized for poor results after moving to Hanwha.
The mistake started from the beginning by bringing in someone who had been resting for over 10 years after resigning as Samsung's manager.
For a team falling into a dark age to become a consistent powerhouse capable of making the postseason, they must completely benchmark the systems of successful teams and overhaul everything—players, managers, coaches, management, and the front office.
For Lotte and Hanwha to become strong teams, they should look at how LG escaped its dark ages to become a consistent powerhouse that regularly makes the postseason.