He was signed by the Seattle Mariners as an amateur free agent on September 25 , 1998 .
Baek graduated from Busan High School , Busan , South Korea in 1998 .
Baek was signed by the Seattle Mariners as an amateur free agent on September 25 , 1998 .
Baek graduated from Busan High School , Busan , South Korea in 1998 .