 In February 2008, with Kim Yong-dae joining the Korean military team Jung was transferred to Seongnam Ilhwa Chunma as a replacement.It came after when his contract with Pohang Steelers was coming to an end at the end of the 2007 and have been negotiation with Seongnam Ilhwa Chunma at some time.Jung Sung-ryong made his Seongnam Ilhwa Chunma debut, where he started the whole game, in a 1–1 draw against Gwangju Sangmu.