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Under Yoo, the Jeonnam Dragons attempted to reorganize the team around a youth movement. However, the team struggled to score goals, and despite Yoo's request, they were unable to land a better forward. His tenure at Jeonnam Dragons ended on August 16, 2018, when he resigned after only three victories, with the team doing poorly in the 2018 K League 1 standings. Jeonnam Dragons would eventually be relegated at the end of the season.