 Following the departure of Kim Byung-ji, Jung Sung-ryong found himself, competing with Shin Hwa-yong over the first choice goalkeeper role.He made his Pohang Steelers debut, where he started the whole game, in a 1–0 loss against Gyeongnam on 22 April 2006.In his follow up match against Daegu on 29 April 2006, he kept his first clean sheet, in a 0–0 draw.