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Are South Korea being underestimated in this World Cup? (1:49)

South Korea advanced to the last 16 of the World Cup with a dramatic win over Portugal. There is a time and a place for it.

3:01 PM ET

The South Korea player insulted the Portugal player when he left the pitch, as the Portugal coach tried to defend the player.

After walking towards the benches, he put his finger to Cho's mouth.

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After the 2-1 defeat which sent South Korea into the last 16, the former Manchester United forward said it was his interaction with Cho that made him angry.

He was angry because the player from Korea insulted him and told him to go away.

"I saw the interaction with the Korea player and I don't have any doubts about it and if you look at the images you seePepe going towards the Korea player."

"He was not aggressive, he was only verbal aggressive, he spoke in English, and he said, 'Maybe he had a bad day'."

Cristiano Ronaldo exchanges words with South Korea's Cho Gue-sung as he leaves the pitch. Marc Atkins/Getty Images

Despite losing to Hwang Hee-chan in the last minute, Portugal still finished top of the group.

South Korea's defeat to Switzerland should serve as a warning to the team as they prepare to face the second-place team from Group H.

Son sends South Korea through.

We are upset.

We wanted to win and have a better game in order to raise the players' spirits. This is a warning to our team.

South Korea will play Brazil in the second round of the World Cup for the first time in five years.

They were heading out until Hwang's dramatic winner which saw them qualify on goals scored ahead of the other teams.

Before the match, Son Heung-min told me I was going to make something.

He said, "We trust you." A lot of my teammates said they trusted me when I was a substitute. I was certain that Son would pass to me when he got the ball. My job was easy because of it.

It was hard to wait for the other result, but we proved we could make it to the knockout phase. We were expecting this and we wanted it. I would like to share my feelings with the Koreans.