Han threw a no-hitter on June 9, 2011, allowing two walks and striking out 17 batters with 104 pitches against Gaesung High School in the Gyeongsang regional preliminary league for the 65th Golden Lion Flag National Championship where he racked up three consecutive complete game shutout wins with 39 strikeouts in 27 innings pitched.

In August 2011 Han was selected as a member of the South Korean U-18 national team for the Asian Junior Baseball Championship held in Yokohama, Japan.

Han was summoned to close the semifinal game against Chinese Taipei in the eighth inning.

He earned a win, hurling three innings and allowing one unearned run in South Korea's 4–3 victory to Chinese Taipei.

[6] As a sidearm pitcher Han combines a fastball that averages early 90 mph with a curveball and a circle changeup.