Quotes of All Topics . Occasions . Authors
By training with some of the world's finest footballers and manager, I feel I have matured in all areas - mentally, physically, and technically.
It doesn't matter how I'm asked to play, or if the football is good or bad: I like football when I'm on the pitch, not when I'm on the sidelines.
I study the other players in training, particularly the forwards, and I look at how they are scoring goals. What do they do when they finish a chance?
When I go home, it is quite difficult. Being at Manchester United means it is a huge thing, and when I walk down the street, most people recognize me.
The likes of Wayne Rooney, Dimitar Berbatov, Michael Owen, and Ryan Giggs - I can see it live every day. I don't have to sit in front of a TV to study it.
We have a long history with Japan. When South Korea play against Japan, the fans tell us that if we lose, they are going to throw the players into the sea.
Europe is leading the world in the sport of football. I want to utilize my experience from Europe to support the development of football in Asian countries.
A lot of the South Korean players are very interested in the Premier League. They ask questions about what life there is like, so I try to give them answers.
There is no question that Korean footballers have the ability to play in Europe. The real challenge is whether they will be able to adapt to western culture.
It's quite difficult to explain, but I really enjoyed playing against Arsenal, and I'm really pleased that we had great results against them during my career.
When I'm back in my country, it's like being David Beckham. But it's like that for David Beckham all over the world. It must be more difficult for him than for me.
Throughout Manchester United's history, we always come up with answers to problems. Big stars come and go, but still, the team keep producing the same performances.
After Sir Alex Ferguson, it's been a difficult time for Man United, but actually, many people know that after Sir Alex Ferguson, it would be difficult for Man United.
In Korea, if a player doesn't play well, you would never criticise him, but in European countries fans criticise their own teams; sometimes they boo them off the pitch.
I wanted to show that Asian players could make it in Europe. But it was far more important for me just to become a better player. That is why I came to Europe from Asia.
Marcus Rashford has done really well. He had a great first season, and then people had really high expectations, but he showed his quality on the pitch in the second season.
Some players aren't able to show their ability in Europe, but some players can - I think the most important quality in the successful players is that they are mentally strong.
I've had fans coming up to me and speaking Chinese or Japanese. It's not a case of mistaken nationality. I just don't think they realise that we don't all speak the same language.
I have a lot of good memories, especially the days when I have lifted trophies. They are great feelings. That is why Manchester United players want to lift trophies again and again.
Although the Premier League is tough because players have good physiques and can switch swiftly in offense and defense, it can be overcome after adapting to the league for a few months.
The biggest thing for Asian players to remember is the football style is different in Europe - as is the culture - so they have to accept that. Mentally, they need to be ready and very strong.
There's no truth at all that I would leave United - I want to stay here, and I have no reason to leave. I would like to stay here for life, of course - why not? It's the best club in the world.
Of my own career, I have many happy memories, but perhaps it - the 2010/11 season, where United broke the record for number of title wins - was the best. I was very satisfied with my performance that year.
We need more of our players to follow the trend and move to Europe, which is the biggest stage in world football, but we're not doing that, and that makes it difficult for us to compete with other countries.
The best goal I have scored for the national team would be during the 2002 World Cup against Portugal. It was my first World Cup and my first goal in the World Cup. It was like a dream, and that's why it was so memorable.
It was funny because on the day that I joined the club, the newspaper that broke the news was one that people don't always trust or believe. Then, when I signed, and there were pictures of me and Sir Alex Ferguson, people believed it.
When I was with PSV Eindhoven in Holland, some people still thought Asian players weren't good enough to play in Europe. It's always good to rise to the challenge and prove them wrong. When I first came to United, I had to prove my ability again.
Maybe one of my strengths was to bring the energy to the team, and then defensively, I contributed a lot compared to other players, which is quite essential for the big matches; you know, against big clubs, you need to be very cautious with opponents that attack.
My father went to catch wild frogs. I was skinny and weak, and my father heard their juice would give me size and strength. It tasted very, very bad... but I had to drink it because I wanted to be a footballer, and everyone said I needed to be bigger and stronger.
In Korea, if a player makes a mistake, the other players don't like to point it out. Rather, they try to embrace it; they take the attitude, 'Let's do better next time.' But in the West, if you do something wrong, another player will make a point of saying something, and you will have to fix it immediately.