I thought the sports law sector would be boring, but it was unexpectedly interesting.Collection: Sports
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?Collection: Chance
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.
To mark Pirlo was not easy.
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.
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.
They are always open to come to South Korea and play, because we never reject North Korean athletes.
All I can do is my best.
I try to help the team to win, and my role is to run a lot and bring energy to the side. It's my job, so I have to do it.
The happiest moment was when I just played with a ball as a boy, carefree, without worrying about anything.
North Korea and South Korea speak the same language, and actually, we are the same country.
Football can make things different, and football can make change around the world. I hope football can do something for Korea.
Many Asian players have seen they can play in Europe at a high level.
I am very happy that I proved Asian players can deal with the high levels of European football.
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.
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.
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.
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.
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.
It was a very difficult decision to leave United.
When I made up my mind for Manchester, I felt I had betrayed Hiddink. I knew he wanted me to go to Chelsea, so I found it difficult.
It would be honour for me to keep playing for Manchester United.
At Old Trafford, we are not afraid of anyone.
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.
It's unbelievable. I never thought I could play for United 200 times.
I love playing for United and have lots of good memories from my time here.
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.
If you have luck on your side and are strong mentally, you can succeed in Europe.
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.
The AFC Asian Cup is the most important and biggest competition in Asia, and we should do our best to win it.
Managers now don't just use 11 players; they have to care about all the squad of 25 or more players.
Mentally, you have to be strong, particularly in away games at the places where the fans are very passionate.
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.
There aren't many Asian players in Europe or the Premier League, so that's more attention for me.
Asian culture is that people are quite excited about the players.
I just want to be a normal person.
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.
Lee Chung-yong has been playing well and trying hard at Bolton and has grown in confidence. His improvement is valuable for the national team.
I have enjoyed every minute of my time at United.
I'm looking forward to playing my part in keeping United at the top of the game.
It's not an easy game at Goodison Park - it's always difficult there.
I need to improve my finishing. I need more goals.
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.
I have to stop rushing things. I have to be composed in my mind and slow things down. I think that will make me a better finisher.
When I am in Korea, I can't walk down the streets. But I don't want to be famous or popular; I just want to be a good player.
Early goals make us more confident and energetic for the rest of the game.
We always try to keep going and stay concentrated. Early goals help that a lot.
Asian fans chase me and shout; it is different in England.
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.
I don't like to be famous.