What is something terrible about Korea ?

Koreans are impatient.
this has been a point of Korea which was developed due to the bad effects caused by their fast growing technology.
For example, foreigners wait even though it takes long time when they use the things like computer and cellular phone but Koreans get angry because they can't wait for a second.
It shows that Koreans are impatient to wait.
We can see this bad habit in the load. When peoples are driving a car, they overtake when the person in front of them go slowly.
As a result, they get into car accidents.

If Koreans learn to be patient for their safety, we can be happier than now.

If I visit a person's home in Korea, what should I do?

In Korea, the type of gestures you will be using when you visit a Korean family's home can be grouped into two.

First, when the house only has a young person in it  and the other is when there is also an old person in the house.

Likewise, the gestures vary in two ways as if my friend is alone or with his parents.

If my friend is alone, I have no scruples about playing with him. 

But if he is not alone, I should do greeting to his parents politely first. And shouldn't drink alcohol, smoke and make a noise.

Finally, I can get the permission to enter his home by acting like this.

When I receive an invitation, I should better bring some presents.

In the Western countries, we should consider his inclination, background etc. 

Follow these things, everyone can have a good manner in Korea!

What advice would you give to a foreigner coming to Korea for the first time?

If you(foreigners) come to Korea, i want to recommend our traditional food like kimchi, bibimbap etc.

There are so many kimchi in other countries, but the original is Korea.

And if you want to know about Korea, you had better go to the GyeongBokgung, Gyeong ju etc.

You can go to the unconventional place because It is commonplace like GyeongBokgung, Gyeong ju, but it's best place to know about Korea history.
Furthermore, if you want to know about Korea tourist attraction, you can go to the place like Insa-dong, Jeongdongjin where almost people knows.

And it will be helpful to you if you can speak Korean even though your Korean ability is not fluent.
So welcome to Korea!