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who won the last 20 under world cup
Ukraine won their first FIFA U-20 World Cup title in 2019.
Who did Ukraine defeat in the 2019 U-20 FIFA World Cup?
Ukraine beat South Korea 3–1 in the 2019 FIFA U-20 World Cup final.
Where did the 2019 FIFA U-20 World Cup take place?
The 2019 FIFA U-20 World Cup was hosted by Poland.

Question: When was the final?
Self-contained rewrite: When was the 2019 FIFA U-20 World Cup Final?