It may well have been a way of avoiding having to keep speaking, but I was surprised by how often my Korean students who had been to Japan (most of them) said that it was basically the same as Korea. Most of the rest of them seemed mainly to have noticed that Japan is clean, which seems like a strange thing to be really aware of on holiday! Perhaps because I went straight from one to the other, I was mainly struck by the differences:
America
Japanese emigration to America a bit earlier
Lots of Korean adoptees in America
American military still in Seoul but totally moved out of Tokyo
Koreans in US famous as shopkeepers
Architecture and housing
In Korea, floors are traditionally made of oiled paper rather than the tatami (rush matting) of Japan
Floor heating is common in Korea
Brick buildings are fairly common in Korea
Wooden housing is much more common in Japan
Beds (rather than the traditional yo and futon) more popular in Korea, including the uncomfortable-looking stone beds
More high-priced bedding in Korea, I’m guessing because it is bought as part of a trousseau
Jeonse/ Cheonse system of paying 80% of the purchase price as a deposit and then staying without paying further rent in Kore
new buildings much more likely to be mixed use in Japan
Korea has officetels, studio apartments in high rise buildings that can also be used as offices etc by small businesses, whereas the starter flat in Japan is usually in a two storey wooden “apaato”
flats tend to be larger in Seoul
In Korea, even modern glass buildings (usually/ always?) have at least a grill you can open to let in real fresh air, whereas in Japan you are usually totally sealed into the building air conditioning, as in most countries.
Even very modern and expensive housing developments in Seoul tend to be pretty ugly.
Arts
Korean films tend to be melodramatic and over the top, whereas in Japan that is only usually true with period dramas
The Japanese tend to like pop stars who can’t sing at all, apparently because they don’t like people getting all high and mighty with their singing skills (the “nail that sticks out gets hammered down” effect)
Rarely see Korean salarymen reading comics in public
Much Korean animation is for Japanese and American companies (e.g. Simpsons)
Body language
Koreans tend to give one bow, whereas Japanese bowing often consists of multiple bows, especially when saying goodbye or thanking someone
Koreans don’t sit in seiza (formal Japanese sitting style on your knees)
Koreans don’t point at their noses to mean “me”
Koreans don’t do the chopping motion to mean “Can I get past?”
Koreans sometimes shake hands with other Koreans
Korean women fairly often link arms or even hold hands while walking along the street
Middle finger much more understood and used in Korea (although they seem to think that the direction your palm is facing doesn’t matter)
Crossed index fingers means “Bill please” in Japan
More kowtowing in Korea, e.g. at lunar New Year when receiving money from parents
Business, economy and money
Korean economy still doing quite well (although possibly just because they haven’t reached the limits of that development model) but standard of living higher in Japan
Much more showing off your wealth in Korea
“Bankruptcy carries little or no social stigma” in Korea (Korean Patterns by Paul S. Crane pg 91)
More income disparity in Korea
Six day weeks more common in Korea, and the change to five day weeks more recent
Much more common to buy extra property to rent out in Korea
Education
More fake degrees and other academic achievements in Korea
Koreans much more likely to study abroad (it has been dropping in Japan for years)
Cram schools in Korea go on until much later than Japanese ones, with the government trying to make them close at 10:30 p.m.
Native speakers assistant language teachers (ALTs) is still fairly new in Korea and not yet spread to all schools, but still well paid and not hived off to dispatch companies like in Japan
Fashion
There are no zoku (tribes of people who follow a very distinctive fashion) in Korea, but individual fashion tends to be more varied than in Japan
Shiny suits in Korea
Plastic surgery is more common in Korea
Very straight and very low fringes much more common in Korea
Huge sunglasses more common in Korea
Korean make up is much more subtle
“Pair look”/ “Couple look” (couples wearing matching clothes) more common in Korea, especially in Jeju and/ or on honeymoon
Festivals, ceremonies and celebrations
Emotional outbursts during Korean funerals are common, but rare in Japan
Peppero Day in Korea (11/11, based on the shape of this Lotte chocolate snack)
Cherry blossom is even more popular in Japan
Guests sometimes come and go during Korean wedding parties, sometimes without even speaking to the bride and groom
Food and drink (table manners are below)
Highly decorative but pretty tasteless rice cakes in Korea
Japanese don’t traditionally eat garlic
Most Japanese food isn’t spicy, and that which is, e.g. mentaiko (spicy cod roe), is often directly influenced by Korean food
Korean “tempura” has much heavier batter than Japanese tempura
Korean sashimi comes with a spicy sauce
Japanese food is much more popular outside Japan
Western food is more common in Japan than in Korea
Korean nori is very different (tastier, frankly)
Metal chopsticks in Korea
Rice is given in small metal bowls in Korea
Free refills are more common in Korea, e.g. of kimchi or drinks in fast food restaurants
Bigger servings in Korea, but often with worse quality ingredients
Korean barbeque meat much thicker than in Japan
Large portions in supermarkets (because more people shop by car rather than bicycle)
More variety of soups in Korea
Terrible beer in Korea. Okay or great beer in Japan, although happoshu is even worse than Korean beer.
Texas Ice Bars in Korea/ English and Irish pubs in Japan
Fried chicken with beer in Korea
Soju more popular in Korea than shochu is in Japan
Rice wine in Korea is often unfiltered makkoli
Korean garlic bread has sugar on it
Lots of Western food, e.g. bagels and muffins, are better in Korea
History
The highest social classes (yangbang in Korea and samurai in Japan) were scholars and warriors respectively (although in reality most of both ended up as public servants)
The Japanese civil service exams were much more socially restricted than Korean ones
Although there were kidnapping of both South Koreans and Japanese by the North Koreans, the Japanese go on about it a lot more
Holidays and celebrations
Koreans still celebrate the lunar new year much more than 1st January
Koreans all get a year older during the lunar new year
Koreans are considered a year old when they are born
Koreans have a big party 100 days after a child is born
Language
Koreans are apparently colourful swearers, whereas swearing hardly exists in Japanese
Korean dialects are apparently more mutually comprehensible than Japanese ones
Japanese usually has two pronunciations for each kanji, one usually being a native Japanese one. Korean usually has just one, which is usually borrowed from Chinese.
Korean newspapers are written almost entirely without Chinese symbols nowadays
Even more borrowing of Chinese vocabulary in Korean
Fewer Konglish expressions than Japlish ones (and a good percentage of that comes from Japlish)
much more likely to have restaurant or shop staff talk to you in English in Korea
Koreans have many more pronunciation problems in English, e.g. b and p, and a and e
Politics
Demonstrations are very common in Korea
Demonstrations in Korea are mainly left wing, and demonstrations in Japan are mainly extreme right wing
Emperor and Prime Minister in charge in Japan, with President in charge and meaningless Prime Minister in Korea
Post-war military dictatorships in Korea
Physical fights in parliament in Korea (though not quite as much as Taiwan)
Religion and superstitions
The Korean traditional religion (based around mudang shamans) is seen as marginal and a bit embarrassing (if still secretly quite popular), a bit like Japanese shamanism but unlike Shinto
Christianity much more common in Korea
Temples in Korea usually found outside big cities
Names in red ink are very unlucky in Korea (apparently this superstition exists but is little known in Japan)
Koreans famous for missionary work in difficult places
More “Buddhists” in Japan (but many don’t even know what Buddhist sect they belong to)
Sport
sumo much bigger than traditional Korean wrestling
Table manners
You are supposed to eat soup with a spoon rather than lifting it up to your mouth in Korea. In fact, traditionally you aren’t supposed to lift any plates from the table.
You aren’t supposed to eat rice with your chopsticks in Korea but rather with your spoon
(Much) lower status people are traditionally supposed to turn away from the table while they drink in Korea
Sharing a glass is a common kind of bonding in Korea
Slurping your noodles in a Japanese thing
Technology
Japanese access the internet much more through mobile phones
Korean internet cafes (PC bang) tend to be hardcore gamers
Online gaming is more common in Korea
There are two Korean television channels dedicated to showing competitive computer gamers
Koreans are less likely to put their phones on silent mode, even in some cases watching the TV without any headphones on it
Phones can be used on the underground and people do so in Korea
Transport
Bicycles are rare in Seoul, unlike Tokyo
Motorbikes riding on the pavement is fairly common in Korea
Cheap taxis in Korea, but bolshy taxi drivers and some rip-offs/ Incredibly expensive taxis in Japan, often with doilies and white gloves but still often don’t know where they are going
unlikely to need overland trains to navigate around Seoul
Misc
There is military service in Korea
The family sized packs of toilet roll, washing powder etc that are common worldwide are also common in Korea, unlike Japan
Japanese can adopt son-in-law into their family if there is no heir, whereas Confucian influence in Korea traditionally makes any kind of adoption taboo
More suicides by famous people in Korea (although recently more or less the same level of suicides in general)
More reports of English teachers being abused for dating local women in Korea
Little paper envelopes instead of paper cups next to water dispensers in Korea (and paper products more expensive)
More family run and unbranded corner shops in Korea
Greater Tokyo much bigger than Greater Seoul, and many more distinct centres
Even less common to be gay and out in Korea
More exercise equipment in Korean parks, and more people using it, whereas older Japanese people are more likely to do group exercises (rajio taisou) in the park
Spitting in the street is still fairly common in Korea
Korean hospitals are generally much newer and keener on getting foreign patients
people reading entire books in a bookshop more likely to do standing up in Japan and more likely to be sitting somewhere in Korea
few chain video rental shops in Korea, probably due to online piracy
more sofas and armchairs in Korean cafes
The traditional way of tying children to your back is more common in Korea, perhaps just because more grandparents looking after kids
Much higher standard of living with a typical foreign teacher’s wage in Korea
Easier to get university jobs in Korea, though some of them pay less than conversation schools
More on this topic
Differences between Janglish and Konglish
Why is it so easy to spot Japanese women in Seoul?
Differences between Japanese and Korean students