CreditJean Chung for The New York Times
SEOUL, South Korea — It was halfway through the first inning of a recent Doosan Bears home game when Han Jae-kwon first climbed onto the performance stage just above the first-base line at Jamsil Baseball Stadium. He had watched the first three outs from the stands, nervously tapping his foot. But now, having tied a traditional Korean robe over his baseball uniform, he looked confident, almost solemn, as he performed a sequence of bows on his hands and knees toward the spectators.
After the formal introduction, Han popped back to his feet and grabbed a microphone.