In February 2003 he was elected to the first-ever bench of ICC judges, for a three-year term.[7] He took office on 11 March 2003 and was assigned to the Appeals Division. He was re-elected to the court in 2006, for a term of nine years.[8] On 11 March 2009, he was elected President of the court.[4]
He has been awarded Cornell University's Distinguished Alumni Medal, the Korean Federal Bar Association's Legal Culture Award, and the National Decoration of Moran Order from the Korean Government.[6]