You have to take off shoes inside. 

You are not allowed to smoke inside. 

You are expected to respect people who are older than you. 

You should not use the first name of your teacher or professor but address them with their title of a position (teacher, professor, etc.) 

You are supposed to pay for the group for lunch/dinner if you are the eldest in the group or in a position higher than the rest of the group. 

You cannot refuse an offer by a Korean friend to pay for your dinner if you are a guest.

You have to take a university entrance exam if you intend to study in higher education. 

You are expected to say hi when you meet people while hiking

You should not sit down next to someone on the bus, if there are available seats

You are expected to stand up in an older person gets on the bus when it is full

You cannot walk in the ski tracks without skis

You are not supposed to sto the car in the middle of the road to take a picture

You have to stop and check if everything is okey if you pass a car with their emergency flash on

You are only able to buy wine and hard liquor in "Vinmonopolet", you will not find it in regular grocery stores and kiosks