I live in South Korea and my biggest shocks were:
-all services are done very quickly (groceries are delivered the next day)
-no one adds milk to their tea or coffee (also barely anyone here drinks tea)
-eating out of the same bowl of soup or stew with friends
-slippers in the bathroom
-90% of bread here is all sweet. Bakeries just sell pastries
-awful driving
-pickled vegetables served alongside most western dishes
-almost no obese people
-room salons of all varieties ( hostess bars where you drink crappy whisky, sing karaoke and have sex with prostitutes)
-rarely every any bar brawls or drunken altercations, people are way more sensible when drunk than we are
-nowhere to buy deodorant... seriously...

我住在韩国,我最大的冲击是:
所有的服务都完成得很快(杂货第二天就能送到)
没人在茶或咖啡中加牛奶(也很少有人喝茶)
与朋友吃同一碗汤或炖菜
拖鞋放在浴室里
90%的面包是甜的。面包店只卖糕点
乱开车
腌菜与大多数西餐一起供应
几乎没有肥胖的人
各种各样的房间沙龙(在舞女酒吧喝劣质威士忌,唱卡拉ok和嫖)
很少发生酒吧斗殴或酒后争吵,人们喝醉时比我们理智
没有地方买除臭剂…真的…