What Yang Min-hyuk should have said is: "I wanted to win the final against Japan and make the people happy."

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It's not that he lacks interview skills; he made such a reckless statement that it makes me doubt what is actually going on in his head.
He should have simply said: "I wanted to make the people happy—those watching the Korea-Japan football match live in Japan or cheering in front of their TVs on a weekend evening."
He shouldn't have had any other thoughts. A player's instinct is to win and to aim for the championship.
"I focused on the match to win, and I am happy that we won."
There are such model answers, and many senior players must have spoken that way.
I don't know if he is intentionally digging his own grave on such a joyful day.