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.
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.
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.
I don't want fame or to make money by appearing on TV, but I would not mind appearing on TV if it is related to what I am doing for football.
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.
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.
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.
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.
The happiest moment was when I just played with a ball as a boy, carefree, without worrying about anything.
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.
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.
By training with some of the world's finest footballers and manager, I feel I have matured in all areas - mentally, physically, and technically.
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?
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.
When we had a good relationship between North Korea and South Korea, we always connected with sports.
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.
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.
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.
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.
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.
