Are there any cases where performance improved as dramatically as KT's Choi Won-jun?

His career WAR over 10 years was only 5,
and last year his WAR was as low as -1.2, making him a player who wasn't much help,
but his WAR for this 2026 season alone is over 7.
It turns out choosing to buy Choi Won-jun instead of Kang Baek-ho was the right decision.