South Korean professional football player who is known for his work as a left back and midfielder for the Ulsan Hyundai club as well as the Borussia Dortmund club. He is also known for his work as a left back on the South Korean national team as well.
He first started his career playing at Soongsil University. After graduating in 2007, he started playing for the Mito HollyHock club. He gained further attention in 2010 when he started playing for the South Korean national team. In 2011 he had several successful seasons with the FC Basel club.
He is known for having won the Swiss Super League during both the 2011 and 2012 seasons as well as the Swiss Cup in 2011 as part of the FC Basel club.
He has two children named Eden/Na-eun and Aciel/Gun-hoo who both starred on the variety series The Return of Superman on the KBS2 network.