Boise Hawks
Lee was signed out of South Korea by the Chicago Cubs in May 2008 at age 17, receiving a signing bonus of $1.15 million. He made his debut in the Cubs system for the Low-A Boise Hawks in 2009 after recovering from Tommy John surgery. He batted .330/.399/.420 with 2 home runs and 33 RBI in 68 games for Boise.