The South Korean international moved to BL6 from FC Seoul in August 2009 for an undisclosed fee.
2011/12 was a season of huge frustration for Chung-Yong after he suffered a broken leg in a pre-season friendly against Newport County.
The injury kept him out until the final home game of the season against West Brom, when he made his return as a second half substitute.
His lack of involvement was particularly disappointing after the fine displays that he turned in during his first two seasons as a Wanderer.
In a different culture, playing a different style of football, the 'Blue Dragon' excelled and became a firm fans' favourite with the skills and ingenuity which made him one of the most exciting prospects in Asia prior to his transfer from FC Seoul.
He announced himself with the winning strike against Birmingham City just weeks after moving to England and went on to secure the 2010 Bolton Wanderers Player of the Year award.
He played a starring role in South Korea's World Cup run, scoring goals against Argentina and Uruguay as his nation reached the last 16 stage.