 However, during a 2–0 loss against Urawa Red Diamonds on 2 May 2018, he was sent off in the 70th minute for a professional foul on Andrew Nabbout and was suspended as a result.He returned from suspension on 12 May 2018, where he played the whole game in a 2–1 win over Kashima Antlers.Over the next several months, Jung Sung-ryong played a vital role in Kawasaki Frontale's victories in a number of matches.