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Most Japan guides assume you are flying in from the US or Europe. If you are coming from Korea, much of that advice is useless — nobody needs to explain chopsticks, rice, or public transport to you — while a handful of small differences catch even frequent visitors out.
Korea and Japan feel close: similar food, similar cities, a short flight. That closeness is the trap. The differences are small and specific, so you assume them away. Here are the nine that matter.
| Korea | Japan | |
|---|---|---|
| Plug / voltage | 220V, round-pin Type C/F | 100V, flat-pin Type A — adapter needed |
| Transit card | T-money / Cashbee | Suica / PASMO / ICOCA (T-money does not work) |
| Everyday payment | Cards and QR almost everywhere | Cash still common in small shops |
| Escalator | Stand right | Left in Tokyo, right in Osaka |
| Late night | Many places open 24 hours | Most shops and restaurants close early |
| Phone calls on trains | Common | Considered rude |
1. This time you do need a plug adapter
Korean sockets take round pins at 220V; Japanese sockets take flat two-pin plugs at 100V. Your plug will not fit. Most phone and laptop chargers are rated for 100–240V, so a simple flat-pin adapter is all you need — but check the label on anything you plan to plug in, especially hair dryers and travel kettles, which are usually single-voltage.
2. Your T-money card will not work
T-money and Cashbee are for Korea. Japan runs on its own IC cards — Suica, PASMO, and ICOCA — and one card works across most of the country. Our Japan IC card guide covers where to get one.
3. Korea is nearly cashless — Japan is not
In Korea you can pay for almost anything with a card or phone. Japan has moved toward cards, but small restaurants, old shops, shrines, and some local transport are still cash-only more often than you will expect. Carry some yen and read our guides to cash versus card and ATMs that accept foreign cards.
4. Stand on the correct side of the escalator
In Seoul you stand on the right. In Tokyo you stand on the left; in Osaka you stand on the right. The switch happens between cities, not between countries, so the habit you bring from Seoul is right for Osaka and wrong for Tokyo.
5. Do not count on 24-hour everything
Seoul rewards late nights: food, cafes, and shopping stay open long after dinner. In most Japanese cities, restaurants take last orders early, many shops close around 8 or 9 pm, and outside the biggest hubs the streets empty fast. Plan dinner earlier than you would at home, and treat convenience stores as your late-night safety net.
6. Keep the phone away on trains
Calls on trains and buses are considered rude in Japan, and priority seats are for silent phones. Set your phone to silent, texts are fine, and keep conversations low. It is one of the easiest ways to blend in.
7. Eating while walking and finding a bin
Street food is a big part of Korean travel, but in Japan you are generally expected to eat near the stall and dispose of the packaging there. Public bins are scarce — largely a legacy of security measures in the 1990s — so carry a small bag for rubbish.
8. Konbini look familiar and are not the same
CU and GS25 will make Japanese convenience stores feel easy, but the product mix and the role differ: you can post luggage, pay bills, buy tickets, and use an ATM that accepts foreign cards. Compare the chains in our convenience store comparison.
9. Do the entry paperwork before you fly
Korean passport holders can generally visit Japan for short tourist stays without a visa, and immigration and customs declarations can be completed online in advance, which saves time at the airport.
Where to go with this
If you are deciding between cities, Kyoto or Osaka shapes a Kansai trip most, and Hakone versus Nikko is the comparison to read for a Tokyo day trip. Shopping seriously? Luggage forwarding saves your arms.
Do I need a plug adapter in Japan from Korea?
Yes. Korean round-pin plugs do not fit Japanese flat-pin sockets. Most phone and laptop chargers handle 100–240V, so a plug adapter is usually enough, but check single-voltage appliances like hair dryers.
Can I use T-money in Japan?
No. T-money and Cashbee are Korean cards. Use a Japanese IC card such as Suica, PASMO, or ICOCA.
Is Japan cashless like Korea?
Not yet. Cards are widely accepted in cities, but small restaurants, shrines, and older shops often take cash only, so carry some yen.
