Some Facts about Koreans

Koreans are very social people.
Eating is a very social event.
Koreans love to order foods in groups and often share many foods.
They love karaoke, in "singing rooms". It is basically karaoke, but in your own private room. (The rooms serve alcohol and you can get rooms for 2 - 20 people. Lots of fun).
They find it quite rude to wipe your nose loudly. They often laugh about foreigners doing so, especially during the launch time (while eating some spicy food). However, burping loudly or even farting is considered a natural thing and one can notice people on the streets and on subways doing this without notice….
Most Koreans are drinkers and smokers
Koreans are one of the hardest working people in the world. They are raised with the mentality that they must work and make tons of money until the day they croak over and die. Percentage wise, Koreans are the number one entrepreneur's in the United States. That comes to no surprise since Korean own most of the dry cleaners, liquor stores, garment factories, fro-yo stores, etc., in the US. Gas companies like Shell and Chevron like franchising stations to Koreans because they know that they will work 24/7, using family members as cheap labor, which in turn means more gallons of gas will be sold.
Koreans are money-hungry, superficial, impatient, and demanding. They want everything now, everything "pa-lee pa-lee" or you'll hear a "joo goo leh" come out of their mouth. They have no seconds to waste since time is money and they love money! It's because of their passionate nature and their drive to succeed that they come off as douche bags and dragon ladies.
Korean women are often called psycho b*tches because of their passion and anger, which is also known as "Korean fury." It might be because of all the spicy foods they eat or the "han" that has been passed down by their ancestors. It's because they know what they want and they aren't afraid to go after it. Rather than sit there and waste time, they'll yell and scream until they get what they want. Or, they'll be coy and toss in a few "yahhh hah ji mah's" and bat their eyes in order to get their way. But hey, Korean women know how to keep their men (Asian or non-Asian) satisfied in every way possible, which is why men love them!

Did I mention how they love money? And kimchi too? ^_^’

Things You Should Know in Korea

In Korea, people don't usually tip. (The food is tasty, cheap, delivery is free, and you don't tip!)
When eating using chopsticks, make sure you don't leave your chopsticks in the rice bowl! (This is only done after someone has died. It is a sign of remorse).
When you pay for something (or hand anything to a korean) pass with two hands. This is a sign of respect. Respect is an important part of korean culture, especially respect towards elders.
Crime rates in Korea are low
Almost 99% of everyone over 18 in Korea has a cell phone
Koreans' attitudes towards westerners is usually welcoming
There are english signs everywhere and usually someone that can speak english is around.
Cafes are very popular here, so you might want a relaxing night at a cafe to chat with friends.

Source:
http://blog.krakowskis.com/
http://www.koreanclassroom.com/life_in_korea.php
http://www.yelp.com/user_details?userid=Fevav507kWyjRywdHKxvyA