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Jung Sung-ryong won his first J1 League title in 2017 while playing for Kawasaki Frontale. The J1 League is the top tier of professional football in Japan. Frontale won the title that year by finishing first in the league standings with 72 points, 15 points ahead of second-placed Kashima Antlers. Jung Sung-ryong played a key role in Frontale's success, making 34 appearances in the league and keeping 14 clean sheets.