Attacking midfielder who made his senior career debut in 2010 for Cerezo Osaka, and joined South Korea's national team in 2010 as well.
He played his youth soccer at Hongik University from 2008 to 2009, and also played for South Korea's U20 and U23 teams.
As a member of Cardiff City he won the championship title on April 17, 2013, promoting the team to the Premier League.
He was born in Gurye, Jeollanam-do, South Korea.
He became teammates with Fraizer Campbell on Cardiff City in 2013.